Sway control
Friction sway control or cam sway control: what is the real difference?
CURT 17200 Trailer Sway Control Kit for Weight Distribution Hitches
$64.99An add-on friction bar with an adjustment bolt, damping a sway that has already begun once it is bolted onto a weight distribution hitch.
Check before buying: A friction bar must be disconnected before backing sharply or reversing on a wet or icy surface, and the trailer-side ball is a separate part on some kits.
Best for: Adding sway control to a plain weight distribution hitch.
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Reese Dual Cam II Weight Distribution Hitch with Active Sway Control, 8,000 lb
$869.09Dual Cam II holds the trailer in a straight-ahead position with spring-loaded cam rollers, resisting the start of a yaw rather than damping one already underway.
Check before buying: Cam systems are more setup sensitive than friction. Bracket position and bar tension have to be right or the cams will not seat, and that is a measuring job rather than a feel job.
Best for: Long trailers on windy interstate routes, where preventing the first yaw matters more than damping the third.
Check price on AmazonFriction sway control and cam sway control fight the same enemy, trailer sway, at two different moments in the same event. A friction bar does nothing until the trailer has already begun to yaw, then resists that motion with a pad squeezing a sliding bar, converting the trailer's own sideways energy into heat. A cam system acts earlier: the trailer sits in a notch machined into a straight-ahead position, and any yaw has to push a cam roller up and out of that notch against spring pressure before it can develop at all.
That is the real distinction, and it is a difference in timing, not a difference in effectiveness for a well-loaded trailer. Friction damps a sway that has begun. A cam resists the start of one. Neither can fix a trailer that is loaded tail-heavy in the first place, because both are correctors bolted onto a rig, not a substitute for getting tongue weight right.
CURT 17200 Trailer Sway Control Kit for Weight Distribution Hitches is the standard example of the friction approach, sold as an add-on kit for a plain weight distribution hitch. Reese Dual Cam II Weight Distribution Hitch with Active Sway Control, 8,000 lb builds the cam approach into the hitch head itself, engaging automatically the moment the bars are hooked up.
How does each mechanism actually work?
Friction control damps motion already happening; cam control resists motion before it starts, and the two mechanisms are not interchangeable in how they fail.
Rule of thumb Widely taught towing convention rather than a published specification. It is a good starting point and it is not a rating.
| Friction sway control | Cam sway control | |
|---|---|---|
| When it acts | After the trailer has begun to yaw | Before the yaw can develop |
| Mechanism | Friction pads resisting a sliding bar | Spring-loaded cam rollers seated in a straight-ahead notch |
| Works in both directions equally | Depends on the specific kit | Yes, by design, from the neutral notch |
| Setup sensitivity | Moderate, mostly bracket position and pad adjustment | High, bracket position and bar tension must be correct or cams will not seat |
| Must be disconnected for sharp backing | Yes, typically | No drilling or disconnection needed for normal reversing |
These are general behaviors of each mechanism as sold across the category. The specific kit's own instructions govern backing, disconnection and adjustment for that model.
Which one actually prevents a sway from happening?
Cam sway control comes closer to prevention, because it resists the initial yaw rather than waiting for one to develop. But prevention here means resistance, not immunity. A trailer loaded with too little tongue weight, the classic pendulum condition where a tail-heavy load lengthens the effective pivot and reduces the weight holding it steady, can still overpower a cam system that was never designed to fight a structurally unstable load.
Friction sway control is honestly named: it controls a sway, it does not prevent the first movement. That makes it a reasonable, cheaper add-on for a rig that is loaded correctly and just wants a margin against wind and passing trucks, and a poor substitute for fixing tongue weight on a rig that sways regularly.
Setup and maintenance differences that matter in practice
CURT 17200 Trailer Sway Control Kit for Weight Distribution Hitches needs its adjustment bolt set for the load and, on many installs, a separate trailer-side ball to mount to; skipping that ball is a common reason a buyer cannot complete the install. It also has to come off, or its tension released, before backing sharply or reversing on a wet or icy surface, which is a step to remember at every stop.
Reese Dual Cam II Weight Distribution Hitch with Active Sway Control, 8,000 lb is more setup sensitive in a different way: bracket position and spring bar tension have to be correct for the cams to seat properly, which is a measuring job rather than a feel job. Get it wrong and the cams may not engage at all, which looks like the product failing when it is actually an installation issue.
Frequently asked questions
Can I use both friction and cam sway control at the same time?
It is unusual and rarely necessary, since a cam system that is set up correctly already resists the yaw a friction bar would otherwise be damping. Stacking both adds cost and complexity without a clear benefit for most trailers. If a rig still sways with a properly seated cam system, the loading, not the absence of a second sway control device, is the more likely cause.
Does either sway control type fix a tail-heavy trailer?
No. Both are correctors bolted onto the rig after the fact, and neither changes where the cargo sits relative to the trailer axle, which is what actually determines tongue weight. A trailer loaded with too little tongue weight can still sway with either system installed. Fix the loading first: move heavy items ahead of the axle, then let the sway control do its job on top of that.
Why does the friction bar have to come off before backing sharply?
A friction bar resists any relative motion between the bar and the pad, including the motion a sharp turn or a wet, slippery ramp naturally produces while backing. Left connected, it can fight the trailer's normal pivoting during a reversing maneuver instead of just damping unwanted sway, which makes backing harder rather than safer. Most kits are designed to disconnect quickly for exactly this reason.
Why is a cam system more setup sensitive than a friction bar?
A cam has to seat into its neutral notch at a specific bracket position and bar tension, and if either is off, the roller may sit against the edge of the cam rather than the bottom of it, which reduces or eliminates the resistance it is supposed to provide. A friction bar tolerates more imprecision because its pads simply squeeze harder or softer depending on the adjustment bolt.
Is cam sway control worth the extra cost over a friction bar?
For long trailers on windy interstate routes, where resisting the first yaw matters more than damping the third one, many owners find it worth the price. For a shorter, lighter trailer towed mostly on calmer roads, a properly adjusted friction bar is a reasonable, cheaper choice. Neither answer changes the loading requirement underneath both systems.
What should I do if the trailer starts to sway regardless of which system I have?
Ease off the throttle, hold the steering wheel straight, and apply the trailer brakes alone using the manual override on the brake controller. Do not use the tow vehicle brakes and do not try to steer out of it. Trailer brakes pull the trailer straight; vehicle brakes push it forward into a jackknife. Then stop and re-check the loading before continuing.
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Researched, not professional advice. This page is compiled from published standards, manufacturer towing guides and product specifications, and owner-review consensus, not hands-on testing. Figures described as a rule of thumb are towing convention rather than published standards, and they are labelled that way wherever they appear. Nothing here overrides your own ratings. Work your payload sum before your tow rating, because payload is the limit that actually binds on most half ton trucks and nearly every SUV. Load a conventional trailer to 10 to 15 percent tongue weight and a fifth wheel to 15 to 25 percent pin weight, and never lighter: a tail heavy trailer is what starts sway. Weigh the rig loaded rather than trusting a brochure dry weight. A weight distribution hitch and a set of air bags both restore ride height and control, and neither one raises a single rating. Trailer brakes are required by state law above a threshold that varies by state, and a breakaway battery that has quietly gone flat is the normal condition of most trailers on the road.