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A big improvement in stability starts with a stronger bar. This 1-1/2" diameter rear anti-sway bar ties the axle to the chassis to balance weight transfer and cut down body roll. You’ll feel the difference right away on the highway—less lean in corners, more control in crosswinds, and a level ride that stays steady even when the road isn’t.
Long hauls and gusty days are easier when the rear stays planted. By minimizing side-to-side movement, this setup reduces the steering corrections you need in wind or when passing large vehicles. The result is a smoother, more predictable drive that helps keep you relaxed and in control mile after mile.
This bar isn’t just thick, it’s tough. The 4140 chromoly steel construction delivers superior strength compared to standard 1020 steel, giving you nearly 30% more resistance to sway. That extra stiffness translates directly into better stability and confidence when you’re loaded or towing heavy.
Instead of rubber, the system uses polyurethane bushings that stand up to oil, gasoline, and ozone. They don’t squish out or wear down quickly, so you get consistent support over time. The included heavy-gauge mounting hardware and bushing lubricant make setup solid and long-lasting.
This rear bar bolts right to the axle and frame using the included hardware—no drilling needed. It’s designed to work alongside most popular aftermarket suspension upgrades, so you can add it to your setup without interference or extra modification.
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews
Received the product in a timely manner. The shipping company used I’d give a no star rating. I received the anti-sway bar bare out of a box or wrapper with the installation part box and a cut out piece of cardboard with the shipping label on it taped to the bare bar with about five yards of packing tape. The bar was scuffed, scratched and chipped with the RoadMaster label destroyed. I realize it’s going to be installed under the front of my motorhome but as much as it costed I would like to be the one to scratch and scuff it. If I was a company installing this on a customers vehicle I’d return it. I do not believe it was shipped from etrailer in this condition.
Great buying experience with ETrailer. Fast shipping and quality constructed part. Noticeable difference in controlling body sway. Very pleased with the bar and highly recommend Etrailer.
Excellent high quality product made a big difference in handling with heavy Artic Fox camper
Give poor rating regarding installation instructions
RM-1109-121 Rear Sway bar for 85 Chevyvan G30 RV. Install was pretty straightforward. I would mount the brackets to the frame first and then the sway bar to the axle. It’s easier to drill the holes without the sway bar getting in the way.
Before I replaced the shocks and upgraded the from sway bar and added the rear sway bar my G30 Chevyvan Winnebago was a wallow wagon. It took 110% focus to drive. Now it drives like a regular vehicle. Smooth. No leaning over when cornering. It’s night and day.
GREAT SERVICE
Dealing with etrailer and the associates James and Lori was a pleasure. Not only did they answer all my question but match priced all my items and saved me over $[XX]. I highly recommend doing business with etrailer and their employee. Thanks again etrailer, and especially James and Lori.
Really nice parts. I like the way the Roadmaster mounts. So far so good.
Arrived swiftly and well packaged, this thing is a beast but fairly easy to install on my own. I used a jack to hold the sway bar in place while I bolted on the bushings and it took me about two hours. Always a pleasure doing business with e-trailer.
12 week delay and $[XX] for a piece of steel that measures about five feet long with a couple bends seems pricey. Improved handling over the .876 thick factory sway bar. Works better than factory however, would like to ask company to consider testing and producing 2” diameter sway bar.
The parts were an exact fit. Some additional notes in the installation instructions would save a bit of time.
It took about 1.5 hours to install in my garage without a lift.
The only modification required on existing suspension was to cut the rear airbag shackle bolt excess thread on the passenger side.
A floor jack was helpful to hold the axel side in place while bolting the shock mount brackets.
A dry fit on the floor prior to installing made the assembly very intuitive.
Excellent choice
Installed this along with a few other components in preparation for long distance travel with a truck camper. Main objective was added control in crosswinds and limiting roll on winding roads and corners. It's performed very well, the coatings and hardware have held up, and the truck handles better in all conditions. Would definitely recommend, especially if heavy bed or top heavy loads are regular,
Arrived on time and was easy to order.
Much heavier duty than the factory anti sway bar. Fit perfect. Had it installed by professional off road shop. Have not hauled the truck camper yet, but I think it will be much stiffer.
Hi Lauren, I got the away bar and can’t wait to get it put on. We have a truck camper and already have a Hellwig big wig sway bar but this is even bigger and hope it does the trick. The end links are 11” p/n B315, are there 14” or 15” versions available?
Thanks
All the contents were delivered in the package. The kit fit perfectly as designed. Ordered for a Ford F-350 Super Duty. Truck handles great!
Walt J.
6/17/2024
Working very well. Great stability more control and reduce sway significantly
2021 F250 diesel: Major improvements not previously having a rear swaybar, Very well made. I drive 50k/ yr and the instant I turned the wheel and drove over out of my driveway down an incline I was very pleased. It is a must have for a Super Duty. Iowa roads are rough. Looking forward to loading the bed tomorrow with a 1500lb pallet on the interstate.
Purchased for 2021 F350 that I haul a large in bed camper. I also haul water as I live out of the city. All the parts for this kit are heavy duty, and not hard to install with hand tools. I have not had the camper back on the truck yet but have hauled water. The sway bar does an awesome job keeping the truck flat and no sway. I am very happy with the quality and excellent job this sway bar does. Highly recommend.
Bruce
9/1/2025
Awesome !one of the better investments for the truck . Keeps it flat and stable very well.
Kate F.
9/2/2025
After waiting 3 weeks the swaybar kit was drop-shipped from the factory. Received and discovered the bushing inserts were the wrong size (too small) for the bolts that were sent. Contacted Roadmaster support and provided them a photo and invoice as requested. The replacement inserts were approved and shipped out. I got metric bolts to go with the inserts I received. I will save the replacements for additional replacements.
The install was fairly straight forward.
Haven't had a chance to tow the 5th-wheel yet.
Info for this part was:
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Brooke M.
2/6/2025
Hey Fred! Reaching out to the manufacturer directly on this is going to be your best bet just because they will be able to confirm fitment for different sized links. They will be able to make sure a different size is compatible since thats not what the original kit comes with. I can send you their contact information, too!