bing tracking image
  1. Anti-Sway Bars
  2. Roadmaster
  3. Anti-Sway Bar
  4. Rear
  5. Steel w Polyurethane Bushing
  6. 1-5/8 Inch Diameter
Roadmaster Rear Anti-Sway Bar

Roadmaster Rear Anti-Sway Bar

Item # RM-1139-149
lowest price pledge
Our Price: $767.90
Anti-Sway Bars

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

This item qualifies for Free Shipping
Shipping Weight: 90 lbs
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
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. 1-800-496-5010 to order Roadmaster anti-sway bars part number RM-1139-149 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.
  • All Info
  • Reviews (1107)
  • Q & A (0)
  • Photos
  • Why etrailer?

Roadmaster Anti-Sway Bars - RM-1139-149

  • Anti-Sway Bar
  • Rear
  • Roadmaster
  • Steel w Polyurethane Bushing
  • 1-5/8 Inch Diameter

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
  • 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
  • Works with front anti-sway bar (sold separately) for absolute stability - available on certain applications only
  • Made in the USA


  • Bar diameter: 1-5/8"
  • Limited Lifetime Warranty

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.

1139-149 Road Master Anti-Sway Bar - Rear

Installation Details RM-1139-149 Installation instructions

This Product Fits The Following Vehicles

Customer Reviews

Roadmaster Rear Anti-Sway Bar - RM-1139-149

Average Customer Rating:  4.8 out of 5 stars   (1107 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.


I purchased this part because of the rocking on my 2011 Tiifen 34TGA built on the Ford F53 frame. After searching I found this on etrailer and I have to say the video and customer support from etrailer is outstanding. The part came quickly. The install is straight forward as the video shows but be prepared for some hard work. Getting the bolts off the frame after years on the road requires a lot of muscle, my 12 gal compressor and Harbor Freight air wrench was not upto the task. You will need a torque wrench that goes upto the 300 ft/lbs required for the plate install. We had to use our legs to get to 300.
After installing I took a long test drive and the difference in handling is amazing. Much less rocking and more stable. I would recommend this anti-sway bar to anyone with this Ford frame.

After a year of use the product is still rock solid and keeping my unit from rockin and rollin on the highway and local roads. I still recommend this for your MH on a the Ford F53 chassis.
Mark S - 05/18/2019

2018 Ford F-53

Purchased Roadmaster front & rear anti-sway Bar and a Reflex steering stabilizer for a 2019 Winnebago Vista 27N. Heidi, customer representative, was extremely helpful assisting me with the order. Products were delivered in three days. The difference in which the RV rides with anti-sway bars and stabilizer installed is incredible. Much smoother ride with very little rocking. The RV is a lot easier to control when taking a turn. High winds and passing 18 wheelers are no longer an issue. The RV stays on course with very little effort on my part. Highly recommend these products for any RV no matter the size and a shot out to for their outstanding customer support attitude.


Roger at etrailer is THE MAN!! I called him because I needed to improve the ride & handling of my RV because she would sway all over the road, especially at highway speeds. Any tractor trailer would suck us into its 'air wake' when passing us. Roger offered me the options of heavy duty front & rear sway bars....heavy duty steering stabilizer....and Sumo Springs front & rear. WOW!! What an incredible difference!! The Coach 'rides on rails' now!! Highly recommend this company & Roger's expertise to anyone reading this!!


I have not been able to get it installed, it is too difficult for my me to do in drive way, the front was easier. I have however installed the front anti sway bar and Roadmaster stabilizer. very happy with handling improvement

Here is an installation video that will give you a visual on the install of your 2016 Ford F-53 to help you out starting at the 6:10 mark:
-- Etrailer Expert Sierra K - 12/30/2021


After installing Sumo springs, Bilstein shocks and steering stabilizer I still felt there was more I could do. I installed the Roadmaster Rear Anti-Sway Bar. The result of adding this last upgrade of the suspension was icing on the cake. My coach now drives as good as my last RV which was a diesel pusher. I believe all of the upgrades came from etrailer. 2012 Tiffin Allegro Ford F53 chassis


Combo of front / rear sway bars and steering stabilizer
Made a huge difference on Class A MH from winds and uneven

2015 Kia Rio

I'm reviewing service and install only. It's January and I'm wintering in our 2015 Winnie Vista 35F in Rio Grande Valley, TX. We are not driving again until April. Then we can judge the result. For now, we are taking advantage of the concrete pad and electricity at the RV park to install :-)
I installed by myself and it took about 3 hours with impact wrench, ratchet, Crescent wrench, etc. Original order with [another website] came with missing parts. Returned and called etrailer. Spoke with Shawnee and she answered all questions. Packaged arrived with all parts. etrailer videos show step by step and are current/updated too. I called as I was completing the successful intall, this time taked to Ed W and ordered the front Roadmaster anti-sway bar and front Sumo Springs too. They will arrive in a few days and I hope to install both in a day. Same detailed videos available by etrailer for each of these items too. Looking forward to the 1,200 mile trip to Iowa as a test drive in the spring.

2012 Ford F-53

Service is excellent. All of the parts were shipped and the installation video was right on. Great product! Made a huge difference in our initial test drive on our 2012 Tiffin Allegro.


Prior to installation of this kit my RV acted like it was going to tip over as it swayed from side to side when I made a turn or was hit by a cross-wind. Post install the drivability of my 37' RV increased by 100%.


The anti sway bar added a lot of stability especially going into curves or dips . I can hold it in the road now.

Dodge Challenger

My challenger went from almost undriveable to a way better handling RV with the installation of this sway bar. I would highly recommend this sway bar


Rear anti-sway bar really stabilized my rig.


I highly recommend installing the sway bar. It, along with the suspension virtually did away with the lean during turns and definitely took away the fight to maintain lane position in the wind. Well worth the money.

Still loving it!! Have taken several trips and still recommend installing. Well worth it. You wont regret it.
Bill P - 04/17/2021


Got delivery in a timely manner. All items were as advertised and installation hardware was complete.
The Sumo Springs and heavy duty sway bars made a SIGNIFICANT difference in the ride and handling.
Would have no problem ordering from this company again. They were also very helpful and patient on the phone.

2018 Holiday Rambler Vacationer XE Motorhome

Great quality parts, easy install have not driven it since installing will give a review update when I do


After installation there was a remarkably difference in how my Mirada Select 37TB handled. It’s close to 40’ with gas powered engine. Ford F53 chassis with V10. I will install front after feeling the improvement from the rear installation. Everything I needed was in the kit. The only hard part was cleaning up the threads on the existing u-bolts before removing. Highly recommend the upgraded, world of difference in my situation.


Had this installed and it really help the feel and sturdiness of my 2018 34PA Tiffin Open Road, well worth the money.

been a year and the sway bar is still working to the feel and sturdiness of motorhome
Doug - 03/27/2022


It helped tremendously on the ride of our RV.


We took our first trip with these installed over the last two months (April & May 2021 4,000 miles). All three of these were put on at the same time front & rear anti sway bars with the extended length U-bolts. The RV handled great.


Substantially improved handling. Easy to install once I borrowed an impact driver and jacked up the frame to provide the needed clearance.


I have notice the handling of my RV has change tremendously. I am glad I purchased the sway anti-sway bar.


Improved the handling in my 2020 Fleetwood Bounder 35K

2017 GMC Canyon

Totally transformed our 2017 Newmar Canyon Star ride. Best investment ever.


My 2019 NewMar Bay Star is a well made class A built on a standard Ford F53 22,000 lb chassis. While the larger tires help with the ride compared to my old E450 Class C, passing traffic and turns caused significant swaying like a yacht on the ocean. After researching various suspension components, I chose to start with the rear anti-sway bar and had experience installing one on my previous Class C. etrailer almost always has the best pricing, so I purchased the RM-1139-149. Ordering was easy and it arrived quickly. I had my mechanic install it and he charged me 2 hours of labor. I took the RV on a road test making various turns across uneven surfaces and a 20 mile trip on the freeway. The improvement was significant; the majority of the rocking was gone and the wind effects were minimized. This will definitely help with driver fatigue. Highly recommended upgrade. Next, I'll be doing Sumo springs for my Class A.

2014 Ford F-53

Both sway bars made an incredible difference in the handling of my Winnebago Vista 27N. I also purchased a steering stabilizer and no longer have to fight my steering wheel to stay on the road. I am literally able to drive with just a couple fingers on the wheel.

The rear stabilizer wasn’t the correct one for my Vista, cause I ordered one for 22,000 pounds, and it didn’t quite fit properly until I made a couple modifications.

I did have to order the extended u bolts for the rear axel as well, and the hardest thing for me was removing and reinstalling the nuts on the u bolts.

Overall I’m thrilled, makes driving much more pleasurable.

Show More Reviews

See what our Experts say about this Roadmaster Anti-Sway Bars

< Previous
123. . .7

Do you have a question about this Anti-Sway Bar?

  • Why

    At we guarantee:
  • Highest quality anti-sway bars for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate anti-sway bar information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Lindsey S
Updated by:
Lindsey S
Employee Wilson B
Updated by:
Wilson B
Employee Matthew E
Updated by:
Matthew E
Employee Isabelle B
Updated by:
Isabelle B
Employee Noah M
Updated by:
Noah M
Employee Jeff D
Installed by:
Jeff D
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Kathleen M
Video Edited:
Kathleen M
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Tammy D
Written by:
Tammy D
Employee Randy B
Test Fit:
Randy B
Employee Brent H
Test Fit:
Brent H
Employee Shane H
Test Fit:
Shane H
Employee Robert C
Test Fit:
Robert C
Employee Conner L
Test Fit:
Conner L
Employee David F
Test Fit:
David F
Employee Ryan G
Test Fit:
Ryan G
Employee Bradley B
Test Fit:
Bradley B
Employee Jonathan Y
Video by:
Jonathan Y
Employee Aidan B
Video by:
Aidan B
Employee Thomas T
Video by:
Thomas T

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.