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Nothing makes a big rig feel sketchy like leaning hard through turns. The Roadmaster Rear Anti-Sway Bar ties the rear axle to the chassis using a thick 1-3/8" diameter 4140 chromoly steel bar that balances weight transfer across the rear. That stiffness cuts down body roll and keeps things level in quick maneuvers or on uneven ground, giving you a more planted, predictable ride.

Crosswinds and big rigs can make any vehicle feel twitchy. This bar links the axle and frame so the suspension resists side-to-side sway when wind or air pressure from passing vehicles hits you. With the extra stability, steering corrections are smaller, lane tracking is smoother, and long stretches of highway feel calmer.
This system isn’t stamped from mild steel. It’s made from solid 4140 chromoly, a chromium-molybdenum alloy that’s tougher than standard 1020 steel and nearly 30% better at resisting sway. At each mount point, durable polyurethane bushings replace the soft factory rubber so there’s less give and more consistent support mile after mile.

The Roadmaster design bolts up with heavy-gauge mounting hardware and fixed end links—no drilling into the frame required. The included bushing lubricant keeps things quiet and free-moving, and the straightforward layout means you can get it installed with standard tools and get back on the road fast.
By cutting out side-to-side motion, this rear anti-sway bar makes handling smoother on long drives. It takes less effort to keep your line steady through turns or gusty stretches, which means less white-knuckling and more confidence behind the wheel wherever you’re headed.
Ratings & Reviews

Fred
8/15/2026
Excellent it works great


Gwendolyn Y.
4/8/2025
No more white knuckling! That's awesome to hear, Kris. I'm glad that this bar helped so much so you can have a more relaxed drive :)

Kris
3/17/2026
I have taken a few trips with the Clatter Cabin now. It’s been enjoyable to drive. Since then I have replaced the exhaust from the engine back with 2 12 inch pipe. I was able to get the pre bent exhaust parts over the axle and clear your rear sway bar nicely. Now she purrrrs!

Kate F.
9/24/2025
Install looks great Steven! I can't wait for you to take it out for a spin so you can see the difference for yourself, it is amazing what a upgraded sway bar does to your ride, no more white knuckles for you, or your wife. What big stops do you have planned on your trip to the West Coast?

Ken
8/19/2025
No complaints with the handling. This is a good sway bar!

Jenny N.
6/25/2024
What I recommend is touching it up with a rust resistant paint like Rustoleum. We will be in contact with you about the damage. Please keep an eye on your email.

Leonard
6/22/2025
After a year and many miles I would give it a five star for sure. Made a great improvement over the stock anti-sway bar. With the rear and front RoadMaster anti-sway along with the RoadMaster steering stabilizer the E-450 33 foot class C motorhome drives like a dream. I highly recommend these three products. If not all at once then this order, 1st rear anti sway bar then 2nd front and then the steering stabilizer with the spring on it.

Dan K.
4/22/2026
wondaful! highly recommended.

Gwendolyn Y.
4/28/2025
High-five on the install, Curtis! Also, thanks for sharing all the pictures and showing all the angles of the sway bar. They are really helpful for anyone looking to tackle this install themselves at home!
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Matthew
10/7/2026
This is a complete game changer when using a truck camper Mine is an Arctic Fox 990. I would list this under a must have accessory when using a truck camper. Unloaded ride when you hit off camber bumps is slightly rougher, but hey its a Ram 3500 dually for hauling heavy stuff. Also the performance when carving twisty canyons with an empty truck is astonishing....Watch out Corvetts, here I come!