How To Install A Friction Sway Control Bar

This is a retrofit page. If your hitch already has four-point sway control built into the head you do not need any of this and should not add it — the four-point roundup explains why an integral head is always working and a bolt-on arm is not. This page is for the owner of a plain spring-bar kit who wants sway resistance without replacing the whole hitch.

Friction sway control: a single telescoping arm clamped between a ball on the hitch shank and a bracket on the trailer A-frame. Tightening its handle increases friction inside the arm, so the trailer has to overcome that friction to rotate. One friction surface, considerably weaker than a four-point head, and it has to be disconnected for tight maneuvering.

Confirm these three things first

A spare hole in the shank. The second ball mounts on your hitch shank alongside the main ball, which means the shank needs a hole for it and enough material around that hole. Some shanks have one from the factory and some do not — and drilling a hitch shank is not a job to improvise. Look before you order.

A flat run of A-frame. The bracket clamps to the trailer’s A-frame and needs a straight, parallel section long enough for its clamp plates. Check the side you intend to use is not occupied by the propane tanks, the battery box, a generator tray or a spare tire carrier.

Which side. Convention is the driver’s side, because that is the side you can reach from outside the trailer while hooking up. But the correct side is whichever one is clear — one bar works the same wherever it is mounted.

The install

1. 1

   Hitch the trailer and tension the weight distribution bars

   Fit the sway bar with the trailer hitched and the spring bars already tensioned, so the geometry you set is the geometry you will tow in. The hitch setup guide covers getting that tension right first.
2. 2

   Fit the second ball to the shank

   Install the sway control ball in the shank’s spare hole on your chosen side and torque the nut to the figure in the kit instructions. The ball has to sit square, not cocked.
3. 3

   Position the A-frame bracket

   Clamp the bracket to the flat section of A-frame so the arm will run roughly parallel to the trailer’s centerline when the rig is straight. Do not final-tighten yet.
4. 4

   Fit the arm and check its travel

   Drop the arm onto the shank ball and the bracket ball. With the rig straight the arm should be partly extended — not at either end of its travel — so it has room to move in both directions.
5. 5

   Torque the bracket bolts

   To the kit’s stated figure, with a torque wrench. Under-tightened brackets slide along a painted A-frame under load, which is the most common complaint about these kits and is an installation fault rather than a design one.
6. 6

   Set the friction handle light, then increase it

   Start near the bottom of the handle’s range. Tow, and add friction only if the trailer still moves more than you want. Too much friction fights your steering on an ordinary corner.
7. 7

   Re-check the bracket after the first trip

   Bolts settle on painted steel. Re-torque after the first outing, then at the start of each season.

Living with it, honestly

A bolt-on friction bar is a real improvement over no sway control at all. It is not equivalent to a hitch with friction surfaces built into the head, and the gap is not only friction area — it is that this one depends on you remembering. Owners who tow a few times a year are the ones most likely to forget.

The honest decision tree runs like this. If you already own a plain hitch and tow a moderate trailer on ordinary roads, fit the bar and build the habit. If you are buying a hitch now, buy one with sway control integral to the head and skip this page entirely — the sway control roundup ranks those. And if you have fitted a bar and the trailer still moves at highway speed, the problem is almost certainly loading rather than hardware: what causes trailer sway works through the six causes in order of likelihood.

What this page is, and is not

We have not fitted these kits ourselves. The sequence above follows the install documentation the kit makers publish and the general practice those documents describe, and the failure modes named are what owners consistently report — stated as reporting rather than as our own experience. Your kit’s own instructions carry the torque figures and clearances that govern; follow them, not this page, where the two differ. Prices come from retailer listing data read automatically, and our method is on how we pick. The coupling hardware this bolts to is covered by SAE J684.