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  1. Anti-Sway Bars
  2. Roadmaster
  3. Anti-Sway Bar
  4. Rear
  5. 1-1/2 Inch Diameter
  6. Steel w Polyurethane Bushing
Roadmaster Rear Anti-Sway Bar

Roadmaster Rear Anti-Sway Bar

Item # RM-1139-146
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Our Price: $786.97
Anti-Sway Bars

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Roadmaster Anti-Sway Bars - RM-1139-146
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Minimize sway and driver fatigue by improving the stability and driveability of your vehicle. The bar on this sturdy, effective anti-sway system mounts to the rear axle and to the frame to balance weight transfer and reduce body roll. 1-800-940-8924 to order Roadmaster anti-sway bars part number RM-1139-146 or order online at Free expert support on all Roadmaster products. Guaranteed Lowest Price and Fastest Shipping for Roadmaster Rear Anti-Sway Bar. Anti-Sway Bars reviews from real customers.
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Roadmaster Anti-Sway Bars - RM-1139-146

  • Anti-Sway Bar
  • Rear
  • Roadmaster
  • 1-1/2 Inch Diameter
  • Steel w Polyurethane Bushing

Minimize sway and driver fatigue by improving the stability and driveability of your vehicle. The bar on this sturdy, effective anti-sway system mounts to the rear axle and to the frame to balance weight transfer and reduce body roll.


  • Minimizes side-to-side movement to improve overall stability of your vehicle
    • Lets you execute turns and quick maneuvers with confidence
    • Allows for a level ride, even on irregular surfaces
    • Reduces driver fatigue - minimizes effort required to keep your vehicle in line
  • Diminishes effects of crosswinds, passing motorists and shifting cargo
  • Designed to fit your vehicle and work in conjunction with its suspension system
    • Attaches to rear axle and to chassis - uses weight of axle to brace frame as it shifts in turns
    • Engineered to avoid interference with most popular aftermarket add-ons and accessories
    • Designed to support your factory anti-sway bar - not to replace it
  • Made with polyurethane bushings instead of the standard rubber variety for a longer-lasting system
    • Polyurethane is durable and resistant to damage caused by oil, gasoline and ozone
    • Less wear means less give in the system and better support
  • Constructed of thick 4140 chromoly steel for superior strength
  • Includes heavy-gauge mounting hardware, easy-to-follow instructions and bushing lubricant
  • Made in the USA


  • Bar diameter: 1-1/2"
  • Limited Lifetime Warranty
  • Application: 16,000 lb and 18,000 lb GVWR chassis

Roadmaster Anti-Sway Bar Installed

Benefits of an Anti-Sway System

The Roadmaster anti-sway bar does for side-to-side movement what a good pair of shocks does for up-and-down motion. You will notice a marked improvement in your vehicle's stability as the bar works to balance weight transfer and reduce body roll. The anti-sway bar acts as a link between your vehicle's frame and its rear axle, using the axle as a brace to more effectively balance the shifting weight of your vehicle as you maneuver it. Lubricated bushings allow just enough pivot and rotation to compensate for the pressure placed on one side of your vehicle when it goes into sudden maneuvers, hits crosswinds or encounters shifting weights.

Roadmaster Anti-Sway Polyurethane Bushings

Superior Construction

The Roadmaster anti-sway bar is made of 4140 chromoly, a chromium and molybdenum steel alloy. This type of steel is considerably harder and stronger than the standard 1020 steel that is typically used in anti-sway applications. In addition, the larger diameter of the bar increases its torsional roll stiffness. The result is a bar that is not only stronger than the competition, but also nearly 30 percent better at resisting sway. The polyurethane bushings and grommets used at the attachment points are durable yet flexible, ensuring that the system is neither so rigid nor so malleable that it becomes ineffective.

1139-146 Road Master Anti-Sway Bar - Rear

Installation Details RM-1139-146 Installation instructions

This Product Fits The Following Vehicles

Customer Reviews

Roadmaster Rear Anti-Sway Bar - RM-1139-146

Average Customer Rating:  4.8 out of 5 stars   (1063 Customer Reviews)

Minimize sway and driver fatigue by improving the stability and driveability of your vehicle. The bar on this sturdy, effective anti-sway system mounts to the rear axle and to the frame to balance weight transfer and reduce body roll.


The install was Relatively easy. The instructions were clear. (Disclaimer I come from a diesel truck background). Probably the best improvement on handling and Tailwag Reduction I’ve done so far(rear sway bar).
So far I have done the Front steering stabilizer (this definitely improved drivability and allow the motorhome to go straight down the road). Then the sway bar on the rear, sumo springs on the front.
I still need to do more hopefully this year.


We find that our RV is more stable and handles better. Wind gusts have less effect on the track of the RV. Also, the wind gusts from large trucks are less troublesome. My wife drives all the time and she is very happy with the result. In addition to the anti sway bar, we installed steering stabilization and heavy duty shock absorbers.


Was ready to sell motorhome because it just was not comfortable to drive. Wife suggested we try the anti sway bars (front and rear) and they made a tremendous difference. Not worried abut semi's coming up on me, great difference in sway while turning, especially on highway ramps. No more gritting teeth and holding on with two hands. Winnebago Vista 29.9 VE. Front and rear anti-sway bars, steering stabilizer, sumo front springs.


Etrailer is by far the BEST place to buy RV parts, period! I didn’t know that they have a price match guarantee, and if it is sold cheaper somewhere else, they will price match it!
Tannith saved me hundreds of $$$! Even on an order I placed the month before, because I was not aware of the price match!
I can’t say enough about their service, communication and dedication that you are getting the right part for your RV.
I will continue to do business with them because they are honest and dependable and provide great updates and communication!
Plus you get to talk to a real person when you call in, plus you can understand them!


This went on our 2019 Windsport 29M. Outside of a couple minor install issues (Breaking frame bolts loose and needing to remove washer on the buttonhead bolt so the shock would fit in) the purchase went great - CS was very helpful the part shipped and arrived quickly.
I just finished the test drive and there is a noticeable difference in stiffness I should mention we already had front and rear Sumo springs and Roadmaster steering stabilizer which are a huge improvement over the stock chassis but still wanted to improve the interstate semi push and unexpected wind gusts . So far so good.

Ive been asked to provide a 1 year update... After the past year I can sincerely say this addition is well worth the price for anyone trying to control roll on class A with F53 chassis. Sumos alone help but adding the rear sway bar makes driving so much more enjoyable.
Larry - 06/10/2021


Helped the sway of our 29' RV a lot. The cross winds are not a problem anymore.

by: 03/30/2022

The sway bar was pretty easy to install and helped reduce the rolling of our RV.

2013 Ford F-53

We were wanting to improve steering and ride on our 2013 Itasca Sunstar Motorhome. Crystal at work with me to select the correct parts to upgrade the front sway bar, add a rear sway bar, add a steering stabilizer and Sumo Springs. McGee Commercial Tire & Service in Fort Myers, FL installed all the parts with a little over 9 hours of labor. Test driving the changes in a brisk cross wind showed us a much better ride, a more sold feel to the rig and better steering. All the parts arrive in a couple days and all were the correct parts for our unit. McGee did a very professional job of installation and I could not be happier.

We continue to be very pleased with the improvement in ride and steering of our motor home since the parts were added. It has made our travel more comfortable and safer due to the improvement in steering and stability.
Ronald - 12/15/2019


The sway bar and bushings have worked wonderfully. I now am able to keep the motor home in my lane of travel when the wind is whipping it good or when the big trucks pass.
Working with was easy as pie, great people all the way around.

Excellent, steering and ride are 100 better! Etrailer answered all my questions and were friendly doing it, something that isn’t found everywhere in this day and time! Thanks etrailer. AAAA
Gary G - 04/12/2020


This anti sway bar, when combined with the steering stabilizer and rear sway bar completely changes the driving experience. The videos do not even accurately portray the difference this pairing makes. My RV is rock steady in the lane, and now has almost no impact from passing big rigs. Fatigue from driving is gone and one handed driving is the norm. The FIRST improvement that should be made to the F53 chassis and it's almost insane that this setup is not standard from the factory on RVs. Installed myself in the driveway.


Placed on a 2014 Newmar BSS 2903. Prior to this product and shocks, unit swayed all over the road. No fun to drive. Following install, RV drives like a dream.


Very happy and satisfied with the the service and support provided by etrailer. There was a missing part in the original order and they steeped up and took care of it quickly and it made it on time to keep my appointment with the installer.

All of the recommended parts have worked as advertised and I will definitely be getting all future needs from etrailer!!


Roadmaster Rear Swaybar #1139-146
December 2019 Installed: March 2020
Installed on a 2017 Winnebago Vista 29VE
Once installed, along with the Roadmaster front sway bar #1139-140, I now have a Ferrari to drive. I already had a Safe-T-Steer installed but it is absolutely amazing how easy this unit now drives. Highly recommend especially to first timers an for us oldies.
Just a few installation comments.
The front bar was a piece of cake to install and done by myself in about 45 minutes. No more to be said.
The rear however (on my unit) wasn't as easy as the videos. Main issue was the 4 frame bolts that had to be removed. Neither my battery impact wrench, a friends Ingersoll Rand impact wrench or a 3/4" breaker bar with 6' of pipe would break them loose. Another friend had a brand new Matco Tools #27790 impact wrench that was spec'd at 1600ft/lbs that still after some hammering did they finally break free. Found similar issue on several post on some RV forums. The only other issue was I have to leave off the 'cut' washer that was supposed to be behind the button head screw (at the bottom of the shock mount) to be able to reconnect the shocks.
Other than that everything else was a piece of cake. Probably 2 hours to install and clean up once those 4 bolts were finally loosened.
Again would definitely recommend. Just get a good impact wrench.


We love it, works great and was easy in stall.


I ordered front and rear roadmaster sway bars, front and rear sumo springs and a Roadmaster steering stabilizer for my 2019 Winnebago Vista 29VE after I picked it up several weeks ago. The drive home was a nightmare trying to keep it on the road. I received all the parts in good shape except the rear sway bar came in with the package all beat up and only had the sway bar not any of the other needed brackets and bolts. I called etrailer and explained the situation, sent pictures of the box and they mailed ma a whole new set immediately not even waiting for UPS to pick up the original one. My son and I installed all of them in my driveway and what a difference! The RV is now sound going down the road even in cross winds and large trucks passing by. Thank you etrailer.


Products (3 items) were shipped the same day I ordered and tracking of the order was exceptional. Customer service can't be beat. I asked questions via email and received a phone call from a tech to answer those questions. Possibly the best company I've ever dealt with when it comes to online purchases.

Still works great. Very noticeable improvement handling.
Kevin - 01/29/2020

2015 Ford F-53

The trial run proved to be very satisfactory.
product delivered a stable ride and in a cross wind was very effective in keeping the unit from swaying.
Very comfortable drive.


We received the product earlier than expected, which was a good thing. After watching the videos on how to install the rear sway bar and front steering stabilizer i'm ready to make this easy install (according to the videos). Now I'm not a gearhead or mechanic but I know my way around tools. The first problem I encountered with both products, which the videos just skim over, is taking out the existing nuts and bolts that are rusted together. This task requires an impact tool connected to a 50 gallon air compressor that will supply a constant 90 psi at the tool. The bottom installation line is, if you're not already geared for this type of work, send it out.
The product should have 5 stars but because of the missing info in the instructions I give it a 3.


Made a BIG difference in how the MH reacts to passing semi’s, wind gusts and ramps!


Should have bought it earlier. Makes a huge difference in driving. It took the rock and roll out for sure. I had to leave off the inside washers on allen bolts to line up the shocks. Installed easily in 1.5hr. Pretreat bolts that need removing with penatraitor.


I have a class A motor home on an F53. They are scary to drive. Called Noah at He knew just what I needed. Front sway bad, rear sway bar and steering stabilizer. Had them installed today and took about 100 mile drive. Wow, what a difference. Delivery was really fast and no one could beat them on price. I would use roadmaster products again. Thanks Noah for all your help!!


The installation of this, plus two other suspension components, has literally changed my RV driving experience for the better. Until these components were installed I dreaded the idea of traveling on any road where the RV would be exposed to passing 18-wheelers, crosswinds or oncoming large trucks. My class A (on the Ford F-53 chassis) was more than a handful to control... it was a nightmare to drive. Now it is a pleasure! We've been on two trips since installation, and the difference is unbelievable. If you have an RV siting on the Ford F-53 chassis, these suspension mods will change your life. We added the front anti-sway bar, the rear anti-sway bar, and the Reflex steering stabilizer. Perhaps the most rewarding investment I have made in a long time. Thanks to the Trailer team for putting together the perfect combination. I had everything installed by a local OTR truck service center, and installation was fast and very reasonable.


Great experience to this point!
I was
hesitant to order the parts online but was very surprised and happy that I did. A very nice young lady answered my call and she was cheerful and knowledgeable about the products. In short, she was great!
My product arrived on time and I was able to easily track its location as it moved across the country since they had provided me an easy online method.
I’m excited to install the Steering Stabilizer and front and rear Anti sway bars.
Thank you etrailer and Odelia for your wonderful service!

Volvo Cross Country

I've put many thousands of miles on my rig since having these anti-sway bars installed. I am amazed at the difference they have made. I used to dread big rigs passing me or any amount of a cross wind. My rig always felt like it was skating. It's all gone. Big rigs and wind just don't affect me anymore. I am currently on a cross country trip. Had many big rigs pass me and cross winds. They are just not what they used to be. I can actually relax while I'm driving and not be just wasted at the end of a long day of driving. These anti-sway bars are the best money I have spent on my Class A RV.


Purchased this sway bar for my class A motorhome along with the front sway bar and steering stabilizer. Got a local RV shop to install. Made a big difference on handling when trucks pass and cross winds hit. Yes you still feel them to a degree, however the white knuckling and fear is gone.

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