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Few things are more frustrating than feeling your rig rock side to side when a gust of wind hits or a truck passes by. The 1-1/2" diameter Roadmaster Rear Anti-Sway Bar ties the rear axle to the frame to balance weight transfer and reduce body roll. Made of thick 4140 chromoly steel, it resists sway nearly 30 percent better than standard bars. The result is tighter handling, steadier tracking, and a more confident feel behind the wheel.
Sharp turns and uneven pavement won’t throw you around when the rear of your vehicle stays level. This setup braces the frame against the axle to keep movement predictable. The bar works like a link between the two, taking the pressure off one side when weight shifts in a corner or on an incline. That means smoother cornering and fewer corrections when maneuvering through traffic or winding roads.
White-knuckling the wheel through wind and passing semis doesn’t have to be part of the trip. By minimizing sway and side-to-side motion, the bar keeps your path steady and reduces the effort it takes to stay in your lane. You’ll feel more relaxed and in control, even after long stretches on the highway.
This isn’t a light-duty setup. The bar’s 4140 chromoly construction is harder and stronger than the 1020 steel used in most factory systems. Polyurethane bushings resist oil, gasoline, and ozone, so they don’t squish out or deteriorate like rubber. That means less give, more consistent support, and a system that keeps performing mile after mile.
No need to cut or weld anything to get the handling improvement you’re after. The kit includes heavy-gauge mounting hardware, easy-to-follow instructions, and bushing lubricant for clean, bolt-on mounting. It’s engineered to fit with most popular aftermarket suspension accessories, so upgrades like airbags or helper springs can still be used without interference.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
Ordered front and back and steering stabilizer, the anti- sway bars were delivered and I had them installed, the steering stabilizer still has not arrived ordered in March.
Bottom line - Yes its worth it.
Installed on 2018 THOR/Axis 25.5
Night and Day driving.
Local shop in Maryland installed for me.
(I had already packed my tools/jacks for moving south).
Their mechanic was impressed with the size over the OEM.
On a related note, got the rear set up as well and running Sumo Springs.
Lowell J.
2/27/2022
This should be an OEM item, not an add on. Now to upgrade the shocks.
need more clarifaction on ford cutaway did they not produce during covid? plackard on door says 2020 title says 2022
Gary
8/2/2025
Does Not fit My 2022 Ford e450 Thor Chateau 27R was told by Etrailer it would fit brackets for slide on drivers side in the way
1000 times better than OEM!!!!!
Great product. Excellent quality
The order shipped fast and was as stated. I will follow up on performance once the sway bars are installed. Can’t wait to try them out. They were much bigger than stock and I am hopeful this will translate into a better driving experience. Thanks for the fast response and guidance on what parts I needed to order. etrailer is awesome. Thanks again
It took over 7 hours to complete the instead 1 hour. I was frustrated due to The bracket around bushing too wide, it doesn’t align with the hole from factory. I had to go to machine shop 2 times to size the hole to align with the factory bolts. The sway bar is too close to rear wheel axle.
Great quality heavy duty seay bar will help in high winds and keep our motor home going straight down the road
Wow what a difference thank you so much for fast shipping and having a video instruction on your website makes a ton of difference. It took me about two hours yesterday to install and thanks to the Video. No modification needed just to drill two holes took it out and felt the difference right away.
Gwendolyn Y.
3/27/2025
Love to hear it! Do you have a trip coming to really give this sway bar a test?
The sway bars have really stabilized my 2019 Minnie Winnie Class C in the wind and passing semi-trucks
Douglas
4/19/2025
Amazing! My class C is less affected by winds, passing of semi, and cornering.
Kate F.
5/5/2025
2024 E-450, a total game changer! Front & Rear Roadmaster sway bars with the steering Stabilizer Bar. Before with factory stuff, white knuckles if you could even get to 55, now, one hand on the wheel, 65, feel safe, you must get these without a doubt
Brooke M.
1/3/2025
Wow, I can only imagine how nice that must be! Thanks for sharing your experience with us. Any travel plans for the winter?
This item has made a huge difference with the drivability of our RV. Highly recommended.
This was a really great product to add to my Class C RV. I have a 2015 Coachmen Leprechaun 319DS (31ft). It made a difference in me driving more comfortably, especially at highway speeds when semis pass by. I don't get knocked around as much anymore. Also turning feels much stiffer. I added all 3 upgrades (front/rear sway) and the steering stabilizer. It is pricey, but well worth it.
Did not fit our 2014 Sunseeker with air bags. It contacts the rear differential. We contacted etrailer and right away they emailed us a label to return the item, and placed an order for a Hellwig anti sway bar which fit perfectly. They're customer support is top notch.
Victoria H.
3/26/2025
Even though these didn't fit your needs, I'm glad to hear we could help turn this experience around for you Jackie. If you ever need anything else, we’re here for you!
Upgrade almost complete on my E450 Quantum LF31. Not hard to install the items. Only have the rear sway bar next month and upgrade will be complete. I also have air bags on the back which helped with the weigh transfer on the unit.
The sway bar was easy to install but did require two new holes through the frame. The location of the holes was easily accessed through the wheel well without removing the tire. The sway was reduced significantly after installation.
I have had these anti-sway bars for around one year. The installation by etrailer was great and the bars work fine. No question that they helped to reduce the impact of trucks blowing by my RV and pushing me off to the side. Glad I purchased them.
Richard C.
5/14/2025
All is good. Pleased with the installation and how well they have improved my safety while driving.
Product arrived quickly as usual with etrailer. The etrailer video was more handy than the accompanying instructions from Roadmaster. etrailer provided videos for both the early E450 and the later chassis installations. While essentially the same, there was a small difference of enlarging an existing hole on the early frame in my case a 2006 and having to measure to locate the hole on the later. It would be nice if Roadmaster included a parts diagram to help with assembly instead of small not clear pictures. I thought the parts package was short two half inch washers, I supplied them from my stock. The fittings on the Roadmaster bar are much heavier than the stock components. Installation is on a 2007 Coach House, motorhome. Took it for a test drive, big difference in handling.
Solid-built sway bar. Helps stabilize in wind while driving. Using on 2016 Thor Vegas 25.3 RV, notorious for suspension and driving issues. Using front anti-sway bar as well with Safe-T-Plus steering stabilizer.
Fairly easy install. Drilling the hole in the frame was decent started with a 17/64 pilot hole then the 17/32 final hole. Take your time and let the drill do the work.
Do be aware of the hole placement on the drivers side as there are brake lines and wiring there.
Terry
4/3/2024
Works better than expected. The rear sway bar on my 2017 F 450 made more difference than any other modification I made.
Easy installation and made a huge difference in the sway and body roll on mt 2019 Thor Motorhome. Wish I would have done it earlier.
This anti sway bar is great. High quality components, easy to install and performs great. Just wish it was designed to use the existing threaded frame holes? Even easier to install (don't have to drill new holes) and it would be a stronger joint.
I recently purchased a 2011 Itasca Cambria 28 with only 10,500 miles. Our first trip made it clear that I needed to stiffen the chassis. Unfortunately Roadmaster Anti-sway bars are backordered, and though you should put those on first, I just installed the Steering Dampener. Easy installation though you need to be careful about seating the bushings. The videos are much better than the printed instructions. Already see a big difference in how much tighter the steering is. Can't wait for the bars to arrive. Disappointed to have to wait 4 weeks.
Jose
12/13/2021
One year later, we have put over 22,000 miles on our rig, and added new tires. The ride is so amazingly better than without the steering stabilizer, and especially the anti sway bars. These additions are absolutely worth the time and money. I would strongly recommend them. You won’t regret it.
Hi Amber, sway bar arrived this morning, wanted to say thank you again. It got a little roughed up in delivery looks like, I think everything is ok but wanted to send you a pic of how it arrived in case we end up missing a piece. See Pic below, Once again, Thanks.. Kevin
I had a helwig system factory installed on my class C when i bought it in 2020. It was ok as i did not know any better. After 6 years of traveling there was a lot of sway and sagging. So i upgraded to this heavy duty Roadmaster system. What a major difference. the RV rides much more steady and smoothly, and i like it. I think the hellwig that was factory installed was the cheapest system they could find, so they could put the name on. I like Roadmaster equipment much better. Working with Roadmaster and E-trailer makes purchasing, installation and tech support much easier.
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Charles
8/26/2023
Anti sway bars have been on over a year still believe was a great investment holds you steady. As for steering stabilizer that one was never shipped from roadmaster. Went with safe t plus and very happy with it.