These hitches differ by mechanism, not by quality, and the mechanism is the decision. Friction damps sway after it has started. Caster and chain tension resist it starting. A four-bar linkage removes the pivot that allows it. Those are three different engineering answers with three different sets of consequences — noise, greasing, weight, price — and no ranking between them.
So this page is organised by how they work rather than as a countdown. What follows is drawn entirely from manufacturer documentation we opened, with every third-party figure labelled as one.
First, the claim this category keeps making
The best-ranked page for this search tells readers that for heavier trailers a weight distribution hitch is “often required by law”, and then explains that claim by describing truck manufacturers’ requirements. Those are two different things, and the slide between them is worth stopping on, because one is enforceable by a police officer and the other is a term of your warranty.
Here is what the statutes actually say.
One state requires it. Iowa Code 321.430 provides that every travel trailer or trailer coach of 3,000 lb gross weight or more intended for human habitation must be equipped with brakes applied by the driver from the cab or self-actuating brakes, “and weight equalizing hitch with a sway control” — plus a separate auxiliary means of applying the trailer brakes from the cab. Trailers drawn by a truck or truck tractor need meet only the brake requirements.
Note the threshold: 3,000 lb, which is a small trailer, not a large one. The claim as usually made attaches the legal requirement to big rigs. Iowa’s rule bites far lower down.
Note also what Iowa requires alongside the hitch, because it is the part that is genuinely near-universal: brakes the driver can apply from the cab. Weight distribution is required in one state; trailer brakes above a weight threshold are required in most, which makes the controller the piece of towing equipment you are most likely to actually need by law. Choosing one is its own decision — the Tekonsha P3 and the REDARC Tow-Pro Elite are the two most cross-shopped, and the axle rating rules one of them out more often than buyers expect.
No other state’s equipment law mentions it. The RV Industry Association publishes a state-by-state summary of trailer brake and equipment law. Across its twelve pages, the words sway and equalizing each appear exactly once — in the Iowa row. The word distribution does not appear at all. The usual requirement elsewhere is that the coupling be adequate for the load; California’s wording, at Vehicle Code 29003, is that a hitch be “properly and securely mounted and be structurally adequate for the weight drawn”.
There is no federal requirement for private towing, and on this Equal-i-zer agrees: its own article on the question states plainly that “there currently aren’t any federal laws requiring the constant use of a WDH hitch”.
What is true, and matters more in practice: your tow vehicle’s manual probably does require one, and the thresholds differ by maker — Ford, Ram, Nissan and Toyota at over 5,000 lb, GM at 7,000 lb for its half-tons. Ignoring that is not a traffic offence, but it is the kind of thing an insurer reads after a claim. The detail is on what size weight distribution hitch do I need.
The default, and the one to beat
Equal-i-zer 10K
Four friction points integrated rather than bolted on, six sizes to land in, and the noise documented by the manufacturer itself rather than discovered by owners.
If you want no friction at all
Blue Ox SwayPro 1000
Caster and chain tension instead of pads, rotating latches, and you can reverse without disconnecting.
If weight and greasing matter
Andersen No-Sway 10K
Under 60 lb against 106.5, no grease anywhere, and friction that rises with the load instead of being fixed.
If the pivot really is the problem
Hensley Ultimate Arrow
Removes the ball as a pivot rather than damping what it allows. Several times the price and about 200 lb of your payload.
The five, side by side
| Model | Approach | Sway control | Hitch weight | How the range is stepped | Price | Buy |
|---|---|---|---|---|---|---|
| Equal-i-zer 10K | Damps sway once it has started, by resisting rotation between tow vehicle and trailer | Friction — four points of steel-on-steel contact, integrated rather than added on | 106.5 lb for the 10K kit, per etrailer's measured shipping weight. Equal-i-zer does not publish a figure | 10% at every rung | $$$ | Check price(opens in a new tab) |
| Blue Ox SwayPro 1000 | Resists sway starting, rather than damping it once begun — the opposite approach to a friction hitch | Geometry and tension — no friction pads. Blue Ox describes it as "reducing sway without noisy friction parts" | Not published by Blue Ox, and we have found no measured figure we trust — unlike the Equal-i-zer, where etrailer publishes a shipping weight | 10% at both ends | $$$ | Check price(opens in a new tab) |
| Husky Center Line TS Plus | Damps sway once it has started, like the Equal-i-zer — the clamping force is set during manufacture rather than adjusted by the owner | Friction, from two sources — clamping force designed into the ball mount at manufacture, plus the spring bar ends against the brackets | Not published | 10% at every rung | $$$ | Check price(opens in a new tab) |
| Andersen No-Sway 10K | Damps sway once it has started, like a friction hitch — but from one load-proportional point rather than four fixed ones | Friction — a single self-adjusting cone at the ball, made of brake-liner material | Under 60 lb, per Andersen | 14% at the bottom, 10% at the top | $$$$ | Check price(opens in a new tab) |
| Hensley Ultimate Arrow | Prevents sway from starting rather than damping it once begun. Hensley's own framing is blunt: "If you can rotate on a hitch ball, you WILL have sway. It's simple physics" | Neither friction nor spring-bar geometry — a patented four-bar converging linkage that removes the ball as a pivot point altogether | Approximately 200 lb, per Hensley — roughly twice the comparable Equal-i-zer and more than three times the Andersen, and all of it lands on the tow vehicle's payload | 10% on the Ultimate Arrow. Hensley publishes no tongue weight rating for the Cub in anything we have read, so the ladder cannot be stated for both | $$$$$ | Check price(opens in a new tab) |
Read the approach column first. Everything else on the row follows from it.
Four mechanisms, three answers
1. Friction at fixed points — Equal-i-zer, Husky. Steel sliding on steel, at four points. Equal-i-zer’s are two rotating sockets in the head and the spring arms against rigid L-brackets. Husky’s first two come from clamping force built into the ball mount during manufacture, which is why the two feel different despite both being “four-point friction”. Friction damps an oscillation once it has begun. It also makes noise, and on the Equal-i-zer you cannot lubricate it away, because the friction is the sway control.
2. Friction that scales with the load — Andersen. Also friction, but from one point rather than four, and made of brake-lining material rather than steel. The tongue weight presses the ball down into a cone of it, so the friction rises with the load instead of being set by a fixed clamp. It needs no grease and the whole kit is under 60 lb.
3. Geometry and tension — Blue Ox. No friction surfaces at all. Positive caster in the head works with tapered trunnion bars to self-centre the trailer, held under constant chain tension. This resists sway starting rather than damping it once begun — the opposite approach — and it is the reason Blue Ox can market on silence.
4. Moving the pivot point — Hensley. Different in kind. A four-bar converging linkage removes the ball as a pivot and places the trailer’s effective pivot point over the tow vehicle’s rear axle. Hensley’s summary is blunt: “If you can rotate on a hitch ball, you WILL have sway. It’s simple physics.” True — and it costs several times the others and about 200 lb of payload. The case for it is a rig that still sways after the free fixes, which is a narrower case than its marketing implies: why does my trailer sway.
The five in detail
The default
Equal-i-zer 4-Point Sway Control Weight Distribution Hitch, 10,000 lb
Why it's here
Full specifications
| Tongue weight | 1,000 lb maximum |
|---|---|
| Gross trailer weight | 10,000 lb maximum |
| Minimum tongue weight | Not published. Equal-i-zer states a maximum for each model and no minimum, which leaves the "do not oversize your bars" advice every retailer gives without a manufacturer figure behind it |
| Sway control | Friction — four points of steel-on-steel contact, integrated rather than added on |
| How the sway control works | Points 1 and 2 are rotational friction inside the hitch head, where the spring arm sockets slide against the head itself. Points 3 and 4 are the spring arms sliding along the rigid L-brackets bolted to the trailer frame |
| Weight distribution | Rigid steel spring bars, tensioned by raising the arms onto the L-brackets. The bars are also two of the four sway control surfaces, so distribution and sway control share hardware here |
| Approach | Damps sway once it has started, by resisting rotation between tow vehicle and trailer |
| Noise | Documented by the manufacturer. Equal-i-zer's owner's guide says "sound is normal with any weight distribution hitch and means it is working as it should" and that "with friction comes sound", naming the hitch head sockets and the spring arms on the L-brackets as sources. Loudest during slow, tight turns and during break-in |
| Lubrication | Bearing grease (Equal-i-zer part 91-00-4250) on the hitch head friction surfaces, "both to manage the sound and to keep the wear under control" — but **"we don't recommend greasing the L-brackets"**, because that friction is two of the four sway control points. Equal-i-zer sells Sway Bracket Jackets (part 95-01-5150) instead |
| Hookup | None. The spring arms rest directly on the rigid L-brackets and are secured with a pin — that contact is deliberate, because it is two of the four sway control points |
| Hitch weight | 106.5 lb for the 10K kit, per etrailer's measured shipping weight. Equal-i-zer does not publish a figure |
| Sizes available | 400/4,000, 600/6,000, 1,000/10,000, 1,200/12,000, 1,400/14,000 and 1,600/16,000 lb tongue weight / gross trailer weight |
| Smallest model in the range | 4,000 lb (the 400/4,000) |
| How the range is stepped | 10% at every rung |
| Warranty | Lifetime to the original purchaser, latent defects only |
| Assembly | American steel, per Equal-i-zer |
Specifications verified August 24, 2026 from Equal-i-zer hitch product page — the four friction points and the model range , Equal-i-zer owner's guide, "What Can I Do About Hitch Sound?" — noise sources, the grease recommendation, and the instruction not to grease the L-brackets , Equal-i-zer warranty — lifetime, original purchaser, latent defects .
Strengths
- Four friction points, integrated into the hitch rather than bolted on as an accessory
- Six sizes from 400/4,000 to 1,600/16,000, so you can usually land on a rung rather than round up
- The noise is documented by the manufacturer, not discovered by owners
Weaknesses
- Loud, and Equal-i-zer says so: "with friction comes sound"
- You must not grease the L-brackets — that friction is two of the four sway points
- Publishes no hitch weight at all; the 106.5 lb figure is etrailer’s measurement
Fit: The L-brackets bolt to the trailer A-frame and are what make the sway control work, so frame clearance and bracket position matter more on this hitch than on a chain-and-latch design. Check propane bottle and battery box clearance before buying.
Buy it if
You want the mainstream answer with the most sizes to choose between, and noise on tight turns does not bother you.
Choose something else if
You park somewhere that makes hitch noise a social problem, or you want to reverse without disconnecting.
The one without friction
Blue Ox SwayPro Weight Distribution Hitch with Sway Control, 1,000 lb
Why it's here
Full specifications
| Tongue weight | 1,000 lb |
|---|---|
| Gross trailer weight | 10,000 lb |
| Minimum tongue weight | Not published |
| Sway control | Geometry and tension — no friction pads. Blue Ox describes it as "reducing sway without noisy friction parts" |
| How the sway control works | Positive caster in the hitch head works with tapered trunnion spring bars to self-centre the trailer, held under constant tension by chains running to rotating clamp-on latches on the trailer frame |
| Approach | Resists sway starting, rather than damping it once begun — the opposite approach to a friction hitch |
| Noise | Marketed against. Blue Ox states the wrap-around chain design "secures chains so they don't make noise" and that constant chain tension and rotating brackets give "smooth, silent towing". Owner-reported experience is a separate matter and we have not tested either hitch |
| Spring bars | Tapered trunnion, spring steel, self-locking — pushed into the pivot heads rather than pinned |
| Hookup | Rotating clamp-on latches. Faster than snap-up bars, better clearance around propane bottles and battery boxes, and you can reverse without disconnecting |
| Hitch weight | Not published by Blue Ox, and we have found no measured figure we trust — unlike the Equal-i-zer, where etrailer publishes a shipping weight |
| Design | Under-slung |
| Shank options | 7-hole, 9-hole and 11-hole |
| Sizes available | 350, 550, 750, 1,000, 1,500 and 2,000 lb tongue weight, to a maximum 20,000 lb gross trailer weight across the range |
| Smallest model in the range | 3,500 lb (the BXW0350) |
| How the range is stepped | 10% at both ends |
| Warranty | Lifetime to the original retail purchaser |
Specifications verified August 24, 2026 from Blue Ox SwayPro product pages — caster and trunnion bar mechanism, the "without noisy friction parts" claim, chain tension and rotating latches , SwayPro owner's manual and installation instructions, 405-0104 Rev R (PDF) .
Strengths
- No friction surfaces, which is the mechanism that makes the others noisy
- Rotating clamp-on latches, and you can reverse without disconnecting
- The widest range here — 350/3,500 up to 2,000/20,000
Weaknesses
- Under-slung design, so coupler style is a fitment question to settle before ordering
- Publishes no hitch weight
- Our sourcing is thinner than the rest: blueox.com blocks our requests
Fit: Under-slung, and Blue Ox sells separate variants for trailers with under-slung hitch heads — the BXW0353 is listed specifically for those, so coupler style is a fitment question to settle before ordering. The rotating latches are the practical advantage over snap-up bars: reversing without disconnecting is a genuine convenience on a tight site.
Buy it if
Quiet and quick hookup matter, or your trailer weight sits at an end of the range the others do not reach.
Choose something else if
You want figures we have verified on the manufacturer's own site rather than through its indexed copy.
Friction, arranged differently
Husky Center Line TS Plus Four-Point Weight Distribution Hitch, 1,200 lb
Why it's here
Full specifications
| Tongue weight | 1,200 lb |
|---|---|
| Gross trailer weight | 12,000 lb |
| Minimum tongue weight | Not published by Husky, which lists a maximum for each model like every other maker here. See the note below on a review that describes the non-Plus Center Line TS in tongue weight bands rather than maximums |
| Sway control | Friction, from two sources — clamping force designed into the ball mount at manufacture, plus the spring bar ends against the brackets |
| How the sway control works | Husky's four-point arrangement differs from the Equal-i-zer's in where the first two points come from. RV.com's review describes it as "clamping force and continuous friction … created by bolting the ball-mount trunnions between the rigid top plate and semirigid bottom plate", with the second part being "friction created by the spring bar ends sliding in the specially designed frame brackets" |
| Approach | Damps sway once it has started, like the Equal-i-zer — the clamping force is set during manufacture rather than adjusted by the owner |
| Weight distribution | Trunnion-style spring steel bars |
| Spring bars | Trunnion style, matched to the tongue weight rating |
| Hookup | Lift brackets |
| Shank options | 10 to 14 inches, in a range of rises and drops to suit different receiver heights, per RV.com's review |
| Noise | Marketed against, but not from a source we could open on Husky's own site. RV.com's review states that "the technology Husky uses in manufacturing this hitch results in very quiet operation without disconcerting squeaks and groans". We have not tested it, and this is a review's wording rather than a manufacturer specification |
| Lubrication | Not published |
| Hitch weight | Not published |
| Sizes available | Center Line TS Plus: 800/8,000 (part 33301, 2 inch ball, and 33302, 2-5/16 inch), 1,200/12,000 (33300) and 1,400/14,000 (33303) lb tongue weight / gross trailer weight |
| Smallest model in the range | 8,000 lb (parts 33301 and 33302) |
| How the range is stepped | 10% at every rung |
| Included | Shank and hitch ball |
| Warranty | Not published on the pages we could reach |
Specifications verified August 25, 2026 from Husky Center Line TS Plus product listing — the four models, their part numbers and their tongue weight / gross trailer weight ratings , RV.com review of the Center Line TS — the clamping-force and spring-bar friction mechanism, shank range, and the quiet-operation claim .
Strengths
- Clamping force designed into the ball mount at manufacture rather than adjusted by the owner
- Marketed on quiet operation, unusually for a friction hitch
- Shanks from 10 to 14 inches in a range of rises and drops
Weaknesses
- A size up from the rest: the smallest is 8,000 lb gross and the next is 12,000, with no 10,000 lb model
- Publishes no hitch weight and no warranty on the pages we could reach
- The quiet claim comes from a review, not from Husky
Fit: A size up from the other bar hitches in these records — the smallest TS Plus is 8,000 lb gross and the next rung is 12,000, so there is no 10,000 lb model to compare like for like. The mechanism is the reason to consider it: friction sway control like the Equal-i-zer's, but with the first two points built into the ball mount at manufacture rather than created by spring arms against L-brackets.
Buy it if
You want four-point friction but the Equal-i-zer's noise is the sticking point, and your trailer suits an 8,000 or 12,000 lb rung.
Choose something else if
Your trailer sits near 10,000 lb, where Husky makes you choose between under and over.
The light one
Andersen No-Sway Weight Distribution Hitch, 10,000 lb
Why it's here
Full specifications
| Tongue weight | 1,400 lb |
|---|---|
| Gross trailer weight | 10,000 lb |
| Minimum tongue weight | Not published — and unlike the bar hitches, Andersen's range does not extend downward: its smallest rating is 10,000 lb gross, so on a light trailer the only Andersen available is one rated far above it, with nothing lower to step down to. The bar hitches reach 3,500 and 4,000 lb |
| Sway control | Friction — a single self-adjusting cone at the ball, made of brake-liner material |
| How the sway control works | The ball assembly sits in a cone of brake-liner material. When the trailer tries to rotate, the ball turns against that liner and the friction resists it. The trailer's tongue weight presses the ball down into the cone, so the friction rises with the load rather than being set by a fixed clamp |
| Approach | Damps sway once it has started, like a friction hitch — but from one load-proportional point rather than four fixed ones |
| Weight distribution | Tensioned chains with motion-dampening springs rather than rigid steel bars. Andersen states the chains resist bounce "by pulling at the right-angle to the up and down movement" |
| Hookup | Chains tensioned by threaded bolts through the frame brackets |
| Spring bars | None. This is the design difference the category usually leads with — Andersen calls it "unlike traditional weight distribution hitches that rely on rigid steel bars" |
| Hitch weight | Under 60 lb, per Andersen |
| Lubrication | None. "No grease required for clean, low-maintenance operation" — the tapered ball is described as grease-free and the friction cone as self-adjusting |
| Noise | Not addressed on Andersen's product page either way. We have not tested it, so no claim is made here |
| Sizes available | 10,000 lb / 1,400 lb up to 16,000 lb / 1,600 lb |
| Smallest model in the range | 10,000 lb — nothing smaller |
| How the range is stepped | 14% at the bottom, 10% at the top |
| Warranty | Lifetime against manufacturing defects in materials or workmanship, per Andersen, with "certain components like cables and locking pins" at 1 year. See the note below on a retailer discrepancy |
Specifications verified August 24, 2026 from Andersen weight distribution hitch product page — grease-free tapered ball, self-adjusting friction cone, chain system, under 60 lb, ratings , Andersen warranty page — lifetime on defects, 1 year on cables and locking pins .
Strengths
- Under 60 lb against 106.5 for the comparable Equal-i-zer — payload you keep
- No grease anywhere; the friction cone is self-adjusting
- Friction rises with the load rather than being set by a fixed clamp
Weaknesses
- Nothing below 10,000 lb gross, so a small trailer gets a hitch that out-rates it heavily
- Its warranty is stated inconsistently between Andersen and its retailers
- Chains and threaded bolts are a slower hookup than rotating latches
Fit: Sold as a universal kit with frame brackets for 3, 4, 5 and 6 inch frames and a choice of drop or rise. The weight is the practical story: under 60 lb against 106.5 lb for the comparable Equal-i-zer, which matters every time the hitch comes off. The range is the practical limitation — nothing below 10,000 lb gross, so a small trailer can only be given an Andersen that out-rates it heavily, with no smaller model to step down to.
Buy it if
You take the hitch on and off often, your payload is tight, or you would rather not maintain friction surfaces.
Choose something else if
Your trailer is well under 10,000 lb gross, where Andersen has nothing sized for you.
The expensive answer
Ultimate Hensley Arrow Anti-Sway Trailer Hitch
Why it's here
Full specifications
| Tongue weight | 1,600 lb |
|---|---|
| Gross trailer weight | 16,000 lb |
| Minimum tongue weight | Not published |
| Sway control | Neither friction nor spring-bar geometry — a patented four-bar converging linkage that removes the ball as a pivot point altogether |
| How the sway control works | The linkage allows movement on the ball in every direction except side-to-side; lateral movement has to travel through the linkage instead. Struts lock the trailer to the hitch so the pair behave as one unit, which relocates the trailer's effective pivot point forward, over the tow vehicle's rear axle rather than at the coupler |
| Approach | Prevents sway from starting rather than damping it once begun. Hensley's own framing is blunt: "If you can rotate on a hitch ball, you WILL have sway. It's simple physics" |
| Weight distribution | Integrated, through weight distribution jacks adjusted with screws rather than by lifting spring bars onto brackets |
| Hitch weight | Approximately 200 lb, per Hensley — roughly twice the comparable Equal-i-zer and more than three times the Andersen, and all of it lands on the tow vehicle's payload |
| Hookup | Struts bolted to frame brackets, with a custom-fit U-bolt kit |
| Lubrication | Not published |
| Noise | Not addressed by Hensley either way. We have not tested it |
| Sizes available | Ultimate Hensley Arrow to 16,000 lb gross / 1,600 lb tongue; the Hensley Cub covers lighter rigs to 6,000 lb gross |
| Smallest model in the range | 6,000 lb (the Hensley Cub) |
| How the range is stepped | 10% on the Ultimate Arrow. Hensley publishes no tongue weight rating for the Cub in anything we have read, so the ladder cannot be stated for both |
| Assembly | US steel with a two-stage coating, per Hensley |
| Included | Main unit, two struts, two jacks, two frame brackets, 7-way electrical extension, safety chain extensions, custom-fit hardware and U-bolt kit, lynch pins, installation wrench. A fixed stinger is standard and an adjustable one is a paid upgrade |
| Warranty | Lifetime on all parts, with a 60-day money-back satisfaction guarantee — the broadest terms of any hitch in these records |
Specifications verified August 25, 2026 from Ultimate Hensley Arrow product page — ratings, approximate hitch weight, materials, what is included, warranty and money-back guarantee , How the Hensley hitch works — the four-bar linkage, the "if you can rotate on a hitch ball" statement, and Hensley's own criticism of friction sway control .
Strengths
- Addresses the cause of sway rather than damping the symptom
- Lifetime warranty on all parts with a 60-day money-back guarantee — the broadest terms here
- Rated to 16,000 lb gross and 1,600 lb tongue
Weaknesses
- Several times the price of every other hitch on this page
- About 200 lb, all of it out of your tow vehicle’s payload
- Addresses one cause; it does not stop crosswinds, low tire pressure or too much speed
Fit: This is the expensive answer, and the case for it is narrow rather than general. It addresses one cause of sway — the pivot at the ball — and does nothing about the causes that are free to fix, so it is worth considering only once tongue weight, tyre pressure and speed have been dealt with. Two practical costs beyond price: about 200 lb of payload, which on a half-ton is a real subtraction, and a substantial assembly bolted to the A-frame.
Buy it if
Your rig still sways with tongue weight measured into the band, correct tire pressures and sensible speed — and the payload can absorb 200 lb.
Choose something else if
You have not yet measured your tongue weight, which is the cheaper thing to fix first.
The number none of them publishes
Every source in this category warns against buying bars rated far above your load, because oversized bars ride harshly. Equal-i-zer’s own phrasing is that “the higher the hitch rating the stiffer the setup is going to be”.
Not one manufacturer here publishes a minimum tongue weight for any model. Equal-i-zer states a maximum for each of its six sizes. So do Blue Ox, Husky, Andersen and Hensley. The advice is real, universal, and has no figure behind it — which means “don’t oversize” is a warning you cannot actually check.
How we chose, and what we did not do
We did not test these hitches, and we are not going to tell you we did. The pages ranking for this query mostly do: a fifteen-product roundup on a site about computing, a “we tested 15” from a car dealership, and an outdoor-gear site that has claimed testing on surge protectors, inverters, hitch locks and now these.
What is here instead:
- Specifications from manufacturer documents we opened, one by one, with the source URLs recorded on each product record.
- Third-party figures labelled as third-party. The Equal-i-zer’s 106.5 lb is etrailer’s measured shipping weight, because Equal-i-zer publishes nothing. Husky’s quiet-operation claim is RV.com’s wording, not Husky’s.
- Gaps left visible. Blue Ox blocks our requests, so its record is thinner and says so. Husky’s warranty is missing. Andersen’s warranty is stated inconsistently by Andersen and its retailers, and we record the discrepancy rather than picking the better-sounding figure.
- No prices, because they move.
- No ProPride, the other pivot-point hitch and one of the strongest voices in this category. Its store blocks our requests, so rather than repeat figures we have not read, it is named and nothing is claimed about it.
Where the buying goes wrong
Buying on brand rather than mechanism. The interesting differences are friction versus geometry versus pivot point, and they are not preferences — they have different consequences for noise, greasing, weight and hookup.
Sizing on trailer weight. It should be hitch load, which is higher.
Forgetting the hitch weighs something. 60 to 200 lb, off your payload, before you load anything.
Buying hardware to fix a loading problem. If the tongue weight is below 10%, that is the fault.
Believing “required by law” without a citation. It is true in Iowa and nowhere else that RVIA records — and what is usually meant by it is your owner’s manual, which is a different kind of obligation.
Reading a roundup that claims to have tested fifteen hitches. Weight distribution hitches cost hundreds of dollars each and take an hour to fit and adjust. Fifteen of them is a project, not a blog post.
Questions worth answering
Is a weight distribution hitch required by law?
In one state, yes. Iowa Code 321.430 requires that a travel trailer of 3,000 lb gross weight or more be equipped with "weight equalizing hitch with a sway control", along with an auxiliary means of applying the trailer brakes from the cab. Across RVIA's 50-state summary of trailer equipment law, the words "sway" and "equalizing" each appear exactly once — in the Iowa row. Everywhere else the requirement is that the coupling be adequate: California's wording is "structurally adequate for the weight drawn". There is no federal requirement for private towing.
What is the best weight distribution hitch?
There is no single answer, because the four hitches here control sway by three different mechanisms and the right one depends on which trade-off you want. Friction damps sway after it starts and makes noise. Caster and chain tension resist it starting and do not. A pivot-point linkage removes the rotation that allows it, at several times the price and about 200 lb. If you want a default, the Equal-i-zer is the one the others are measured against.
Which weight distribution hitch is quietest?
Blue Ox and Husky both market on it and Equal-i-zer documents the opposite. Equal-i-zer's own owner's guide says "with friction comes sound", naming the hitch head sockets and the spring arms on the L-brackets. Blue Ox describes "reducing sway without noisy friction parts". We have not tested any of them, so treat the mechanism as the fact and the outcome as the manufacturer's claim.
Do you actually test these hitches?
No, and neither do most of the pages ranking above this one, whatever they say. Every specification here comes from a manufacturer document we opened, and where a figure is a retailer's measurement rather than the maker's — the Equal-i-zer's 106.5 lb hitch weight, for instance, because Equal-i-zer publishes none — it is labelled as such on the record and in the table.
How much should a weight distribution hitch cost?
The mainstream bar hitches sit close together, and the pivot-point class is several times that. We do not publish prices because they move and because a price on a page is stale within a week; the price bands in the table show the relative positions, and the merchant link shows the current figure.
What size do I need?
Match the hitch to your hitch load rather than your trailer weight — they are different numbers, and every maker here except Andersen builds its range at exactly ten to one. That is a page of its own: what size weight distribution hitch do I need.
Will one of these stop my trailer swaying?
It will help, and it is not the first thing to try. Tongue weight, tire pressure and speed cost nothing and fix more sway than hardware does. Fitting a hitch to a trailer loaded tail-heavy masks the fault rather than correcting it.
Does the hitch weight matter?
More than the category admits, because it comes out of your tow vehicle's payload before you load anything. The hitches here run from under 60 lb to about 200. On a half-ton whose payload is already the binding limit, that spread is a real consideration — and two of the five makers publish no figure at all.