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The 1-1/2" diameter Roadmaster Rear Anti-Sway Bar ties the rear axle to the chassis to balance weight transfer and reduce body roll. It minimizes side-to-side movement so turns and quick maneuvers feel steady instead of sloppy. You get a level ride even on uneven highways, and the bar works with the factory setup to add support where it matters most.
Crosswinds and passing trucks don’t need to push you around. By diminishing sway and tail-wag, this bar helps keep the rear of the vehicle planted. The steering stays steady, so you spend less effort correcting and more time just driving. Over long stretches, that translates to less fatigue and a calmer, more predictable ride.
This isn’t made from basic mild steel. The bar is built from thick, black powder-coated 4140 chromoly alloy—stronger and stiffer than standard 1020 steel—and it’s nearly 30 percent better at resisting sway. Polyurethane bushings replace the usual rubber, so they won’t break down from oil, gas, or ozone. That means less flex, longer life, and consistent support mile after mile.
The system mounts to the rear axle and frame using included heavy-gauge hardware and bushing lubricant. There’s no drilling required, and it’s designed to avoid interference with most aftermarket accessories. If needed, extended-length U-bolts are available separately for setups that require extra thread length. Once bolted up, you’re ready for a steadier, more confident drive.
Built to last, this Roadmaster bar carries a limited lifetime warranty. It’s engineered for strength, fit, and stability, giving you the kind of performance upgrade that makes every trip more controlled and comfortable.
Customer Satisfaction Score:
94% were satisfied with this product
6% of customers were not satisfied
Ratings & Reviews
Just got it today but all look good
Have not opened. Looks good in the pict ure.
great product worked great
Driving in the wind is a breeze. No more rock and roll. Great product. Very Happy
It works great. I can definitely tell a difference.
Very pleased with the improvement in ride and handling after about a year of use. Would certainly buy again!
Great delivery. Checked all parts, ready for installation.
took a lot of the rock and roll out of the coach
product worked as advertised and made my motorhome more easier to drive with hardly any tail wagging love the product
product worked as advertised and made my motorhome more easier to drive with hardly any tail wagging love the product
WHAT A POWERFULL ADDITION TO MY OLD TIRED FACTORY SWAY BAR , HOWEVER THE CHASSIE BRACKECTS HAD TO BE MODIFYED, NOT A GOOD FIT.
Sway bar made a big difference driving in windy conditions. The motorhome is much more stable than before.
ALTHOUGH I HAVE NOT INSTALLED IT YET, I AM SURE IT WILL BE
OK, THE WEBSITE WAS WELL WRITTEN AND EASY TO UNDER
STAND, AND THE ANTI SWAY BAR WAS DELIVERED TWO DAYS BEFORE PROMISED. GOOD JOB
What a serious improvement on my motorhome made it so stable. It’s actually unbelievable how nice it drives now easy to install fit perfect. Just amazes me every time I drive it how nice it is to drive. I don’t feel like I’m gonna roll over anymore.
Sway bars and steering dampener are installed and the sway has been reduced and dies out much quicker. I am 80 and was able to install everything myself but it is hard work.
All the products I have ordered arrived promptly and in secure packaging. The pricing was great and with the free shipping I doubt you will find it for less anywhere on the net. I definitely will do business with the guys again. I will be sending photos of completed project when I am finished installing.
Thanks
Steve.
I just received the product, which weighs in at "Over 70 pounds" according to the UPS tape attached, and will be returning it unopened once I receive the Return Authorization slip. Please note that this action had to be taken because of "Operator Headspace"on MY PART !!! I failed to properly read the requirements and limitations in their advertisement. The 1139-143 is for a motorhome with the Ford F-53 for an up to a max of 34 foot motorhomes. Mine is a 37 foot and need the one for 18,000 to 24,000 lb. My mistake and the correct one is on the way thanks to the help from the wonderful service personnel at etrailer.com. Great service for less than smart people like me... Thank you so much etrailer.com!!!
purchased a 1995 Fleetwood storm 30ft in 2018 install new tires and a alignment
went on a trip to AK from Mi it was exhausting trying to keep it straight and from swaying when trucks pass us . in 2019 I purchase a RM1139-143 sway bar from E Trailer Installed it and went on our trip back to Ak . This time no swaying when semi passes drove straight not exhausted at the end of the day Very , Very pleased with the difference it made
I Install it my self not real difficult if you have some basic mech. skills
Excellent product. Well made. Great instructions. Easy install with proper tools.
Made an incredible improvement in the handling of our 35 ft MOTORCOACH with F53 chassis.
All necessary hardware was included. Delivery and shipping by etrailer was spot on.
Would definitely recommend to anyone wanting to greatly decrease sway in a coach.
Installed on a Tiffin Allegro 31SA by Whited Truck and RV Center in Auburn, Maine. The Roadmaster anti-sway bar and associated parts are rugged and of high quality. Installation time was about 3 hours; drilling the frame to secure brackets took the longest time. This anti-sway bar improved handing and reduced sway, especially on rough secondary roads.
Roadmaster Rear Anti-sway Bar and Roadmaster Reflex Steering stabilizer made a 1000% difference on my driving experience. No more being pushed around by the big rigs or the wind. I recommend these upgrades to any motor home.
2004 Monaco Monarch
Ford V10
I love both of the Roadmaster anti-sway bars I had installed right before a trip to Iowa. I purchased bushing kits for front and rear but, I didn't know the front sway bar came with new bushings. So I have an extra front sway bar bushing kit. The biggest difference I noticed right away was the handling on the highway. The people I talked to at etrailer were very helpful and always are when I call. Thanks
Everything pretty much fit like it should. Seemed to reduce the heavy rocking when You make sudden turns or coming out of a parking lot where the road is at a different level.
Wow, This sway bar is big, heavy, beefy and strong. I saw all the great reviews but was still surprised when I got it. Installation was straight forward but I did have to have a mechanic shop jack the RV up and take the huge bolts of the U-bolts because my impact wrench was not strong enough. I've only put a few mines on it since I installed it but I have already noticed a difference.
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Wallace
9/7/2021
made a big difference in my fleetwood bounder