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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 - 1-1/2" Diameter

Roadmaster Rear Anti-Sway Bar - 1-1/2" Diameter

Item # RM-1139-146
Retail:$1,011.31
Our Price: $842.93
You Save: $168.38
Anti-Sway Bars

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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 etrailer.com. Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster Rear Anti-Sway Bar - 1-1/2" Diameter. Anti-Sway Bars reviews from real customers.
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Roadmaster Anti-Sway Bars - RM-1139-146

  • Anti-Sway Bar
  • Roadmaster
  • Rear
  • 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.


Features:

  • 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


Specs:

  • 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 Satisfaction Score:


Customer Reviews

Roadmaster Rear Anti-Sway Bar - 1-1/2" Diameter - RM-1139-146

Average Customer Rating:  4.8 out of 5 stars   (1767 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.

by:
2018 Ford F-53

My anti/sway bars came so fast way ahead of time and I am so happy ETrailer site was the easiest site to order from and super easy to find the right product and get it ordered and the People are so friendly to talk to and so very helpful 100 % pros, they know their stuff !!! if you need it call them or email them or just Order online and know your getting the best part and price !!

Greg

8/30/2023

Wonderful product and its smoothed out our RV ride less sway than ever before and it was simple to install.



by:

Had this installed along with a front sway bar & steering stabilizer. The rig doesn’t wear me out anymore, I can drive all day long. Just the result I was hoping for.



by:

Having the front and rear sway bars on my Jayco Alante 31 V has made a tremendous difference in the handling. As always the service from your company is exceptional !!!



by:

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.

Donald C.

3/30/2023

We are still pleased with the product.



by:

Added this sway bar to our 29' Winnebago. Great results and a great upgrade for stability. Installation was straight-forward, hardest part was breaking loose the original bolts.



by:

This motorhome would rock side to side going down the road, we ordered this sway bar kit and it has helped tremendously.
Great product.



by:

Parts came in 3 working days. Packaged well and all parts included. Gwen took the order was very professional and knowledgeable. I am have parts installed next week and look forward to driving the motorhome to see how it is improved.



by:

Well built. Well designed. Installation was easy. Improved the handling/ride quite a bit!



by:
Roadmaster

Thank you ET for such a great product. The easy install was great. I did it all in my drive way. The Roadmaster 1139-146 really tamed the rear of my 2019 Thor wind sport.



by:

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!



by:

just took a short trip with my motorhome about 300 miles with new anti-sway bars installed on front and rear axles, totally impressed with ride and handling remove sway from my motorhome about 75 to 80 percent. I would recommend roadmaster's product and your company's knowledge and service, job well done, thank you



by:

great product does what it is supposed to do, rig does not wander anywhere near what it was before installing the sway bar.



by:

Installing it by myself was not hard at all. Definitely heavy duty.
Assistance on torque specks via their tech dept was outstanding.



by:

11/2022 we were forced to leave Florida running from Hurricane Nicole. With 25mph cross winds and +15mph gusts our 2016 Vista LX, 31 footer, was a handful to say the least. Without etrailers sway bars and bump stops we would have not been able to maintain our 50 to 55mph highway speed, better yet we probably would be in a ditch with other RV'S, 5th wheels and 18 wheelers. These items are amazing. I did have installed the Safe T Steer because etrailer was way behind on their steering stabilizer. Thanks you etrailer. BTW, if you are in the Indianapolis area I recommend Warner Springs on Bluff Rd. to do your install... Great people.



by:

The finish is not very good. It has scratches everywhere
Shawnee from etrailer was great!



by:

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.



by:

We recently installed the Roadmaster Sway Bars along with Sumo springs from trailer on our 2017 Winnebago Vista 31T which utilizes the Ford F53 chassis. What a game changer in the overall ride and handling. Customer service was excellent and I highly recommend the company for their high quality product.



by:
2018 Thor Windsport Motorhome

I am giving the Anti-Sway Bar an excellent rating based upon quality. I did find the instructions and videos helpful, but it was evident that this Anti-Sway Bar is a little unique. For example the tapered bolt and washer for the lower shock assembly required the washer to be removed in order for the shock to remount properly. This may be due to my shock assembly being angled. Additionally, the instructions did not indicate the shock should be reinstalled prior to the initial shackle test fit. But again my overall rating is excellent. Just some hints for the next installer.



by:

We installed front and rear anti sway bars on our Winnebago Vista and they significantly reduced the swerving motion that we were experiencing. We’re very pleased.



by:
2019 Winnebago Vista Motorhome

I had already installed a rear trac bar but on an extended trip to to Yellowstone and Mount Rushmore we we’re still struggling with sway. These bars have really helped.



by:
2015 Ford F-53

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



by:
2013 Ford F-53

We were wanting to improve steering and ride on our 2013 Itasca Sunstar Motorhome. Crystal at Etrailer.com 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.

Ronald

12/15/2019

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.



by:

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.

Larry

6/10/2021

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.



by:
Roadmaster

I love the roadmaster sway bar I got for my 2017 Thor motor home you guys are great so helpful and knowledgeable we also purchased the sumo springs which with the sway bar and sumo springs I can drive with one hand even when the trucks pass us hardly. any sway handles great now Thankyou again for the great service I won’t shop anywhere else



by:

What a big difference it made driving my RV across the country. A must do to stop the rocking and swaying of my RV.


25
1617
Show More Reviews

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

  • Rear Sway Bar Recommendation for 2014 Georgetown 270s
    The correct rear sway bar for your 2014 Ford F-53 with a v10 engine and 18,000 lb GVWR is the Roadmaster # RM-1139-146. The thicker bar will be a bit stiffer which in some cases may cause a harsher ride quality if used on a lighter RV. The Roadmaster # RM-1139-146 has a diameter of 1-1/2 inch which is still thicker than the OEM bar on your coach. Your RV actually comes in on the lighter range of the GVWR range for this sway bar so it would be more than adequate.
    view full answer...
  • Can I Install Roadmaster Rear Anti-Sway Bar Upside Down
    Roadmaster Rear Anti-Sway Bar part # RM-1139-146 can only be installed in one orientation. It is not designed to be installed upside down. I have attached a photo of what the installation should look like.
    view full answer...
    Image 1 for
  • Recommended Anti-Sway Bar for Forest River 30DS FR3
    The best solution for the problem you are experiencing is an anti-sway bar. An anti-sway bar will help with the side-to-side movement, or zigzag, you are experiencing. They are designed to help keep the motorhome going straight down the road If you are interested in Roadmaster, the anti-sway bar I recommend for you is the Rear Anti-Sway Bar for Motor Homes # RM-1139-146. This bar is designed to help assist the factory sway bar, not replace it. This anti-sway bar fits coaches with 15,700,...
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  • Torque Values for Installation of Roadmaster Rear Anti-Sway Bar
    Please note the attached installation instructions for the Roadmaster Rear Anti-Sway Bar, # RM-1139-146 torque values for all hardware are listed on page 4.
    view full answer...
  • Which Roadmaster Rear Sway Bar Fits 2020 Jayco Alante 26X Built on Ford F-53 Chassis
    Yes, the Roadmaster Sway Bar part # RM-1139-146 does fit your 2020 Jayco Alante 26x built on a Ford F-53 chassis with a 16k GVWR.
    view full answer...
  • Rear Sway Bar Recommendation for 2018 Winnebago Vista
    I looked up the GVWR of the 2018 Winnebago Vista and it looks to be between 16k and 18k which means that for a rear sway bar you would want the # RM-1139-146. For the F-53 chassis like what your RV has this will make the biggest ride quality improvement. I attached an install video for this for you to check out as well.
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    Image 1 for
  • How To Reduce Back End Sway in a 2016 Jayco Alante With F-53 Chassis
    In order to reduce sway with your 2016 Jayco Alante, I recommend using the Roadmaster Rear Anti-Sway Bar, # RM-1139-146. The bar will mount to your rear axle as well as your chassis to minimize how much side-to-side movement you get and improve the way your RV handles. I have included links to a video review and install, as well as a link to an article on stability control for large vehicles such as your Jayco.
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  • Rear Sway Bar Recommendation for 2015 Winnebago Vista 27N
    I looked up the GVWR of the 2018 Winnebago Vista and it looks to be between 16k and 18k which means that for a rear sway bar you would want the # RM-1139-146. For the F-53 chassis like what your RV has this will make the biggest ride quality improvement. I attached an install video for this for you to check out as well.
    view full answer...
    Image 1 for
  • Would Installing Roadmaster Rear Anti-Sway Bar # RM-1139-146 Ever Require Longer U-Bolts
    The Roadmaster sway bar part # RM-1139-146 does not require the optional longer u-bolt set like some of the other sway bars might need.
    view full answer...
  • Does the Roadmaster Rear Sway Bar Need to Be Installed Completely Parallel to the Ground
    When installing the Roadmaster Rear Anti-Sway Bar # RM-1139-146 you do want the trailing arms of the sway bar to be as parallel to the ground as possible. I can see what you're talking about, and they do look like they're angled slightly upwards. If you watch at the start of the videos where the road test is done, you can get a pretty good idea of what it's supposed to look like when installed. It may not be able to be installed completely level because of different components that are...
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  • Sway Bar for 2018 Thor A.C.E. Built on Ford F-53 Chassis
    The rear anti-sway bar that fits your 2018 Thor A.C.E. that was built on a Ford F-53 chassis is the Roadmaster Rear Anti-Sway Bar # RM-1139-146. This sway bar works on a chassis with a GVWR of 15,700, 16,000 or 18,000 lbs; your RV has a 16,000 lb chassis which makes this sway bar a fit.
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  • Will A Rear Anti-Sway Bar Help Stabilize A 2014 Fleetwood Bounder Classic Class A Motorhome
    Typically the sway bars put on vehicles and motorhomes by the manufacturers are much smaller than aftermarket options, which offer more support and stability while driving. Sway bars are going to help minimize sway and body roll for a much smoother ride. If your 2014 Fleetwood Bounder Classic has an F-53 chassis and GVWR of 18,000lbs then the Roadmaster Rear Anti-Sway Bar # RM-1139-146 you were looking at would be the correct fit for you.
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  • Will Using Anti-Sway Bar on Thor Ace 29.3 Motorhome Void the Warranty
    When installing aftermarket products on your vehicle, such as an anti-sway bar, consumers are protected by the Magnuson-Moss Warranty Act. This act states, in part, that unless the installation and aftermarket product actually caused a problem, then the installation and use of an aftermarket product will not void the warranty. You can learn more about the Magnuson-Moss Warranty Act online. We have several anti-sway bar models available. From my research, it appears that modern Thor Ace...
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  • Which Rear Sway Bar Fits 2008 Winnebago Vista 30B 18000 GVWR
    Yes, when picking out a rear sway bar for a motorhome like your 2008 Winnebago Vista 30B it is important you match the GVWR of the MH to the sway bar. The # RM-1139-146 is the correct fit and would be what you need. If you go with a higher rated sway bar it will give you a harsher ride quality than you'd want so it's not recommended.
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  • Sway Bar Recommendations for 2015 Thor ACE 29.2 to Reduce Sway
    The best improvement you can make to your 2015 Thor ACE Class A motorhome built on a Ford F-53 chassis will be a rear sway bar. For that you'd want the part # RM-1139-146. The next biggest improvement you'll see is with a front sway bar. For that you'd want the part # RM-1139-148. I attached install videos for both bars for you to check out as well. With either just the rear bar or with the front and rear bar you'll see a drastic improvement!
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  • Rear Anti-Sway Bar Compatible with 2019 Fleetwood Southwind K35 with 22000 lb Power Platform Chassis
    Thanks for reaching out with your VIN. I reached out to Roadmaster and they were able to confirm a fit for you based on it because it clarified your chassis fit. You will want the Roadmaster Rear Anti-Sway Bar for Motorhomes # RM-1139-149. I've attached a couple videos to help further.
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  • Recommended Rear Sway Bar for a 2017 Thor ACE 29.3 on a Ford F-53 Chassis
    In order to determine the correct rear sway bar for your 2017 Thor ACE 29.3 on a Ford F-53 chassis, you will need to take a look at the rear shock mounts. If the rear shock mounts have two holes and are parallel to the ground (see photo) then you will want to use part # RM-1139-145. If the rear shock mounts do not look like this then you are going to want to use part # RM-1139-146. I called my contact at Roadmaster to confirm this. I have attached an install video on each sway bar for...
    view full answer...
    Image 1 for
  • Which Rear Sway Bar For 2020 Winnebago Adventurer
    No. You'll want to stick with the # RM-1139-146 instead of the # RM-1139-149. While they may look the same, there will be some subtle differences that would create fitment issues when trying to use a larger sway bar on a smaller coach than it is designed for. This could create handling issues that would pretty much negate what the enhancement was designed for. For your 2020 Winnebago Adventurer with a 18000-lbs GVWR, the correct rear sway bar is the Roadmaster # RM-1139-146
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  • Rear Sway Bar Recommendation for 2016 Jayco Alante 31 Ford F-53
    The correct rear sway bar for your 2017 Jayco Alante 31 ft 18k GVWR on a Ford F-53 chassis is part # RM-1139-146. I called my contact at Roadmaster to confirm this. I have attached an install video on this sway bar for you as well.
    view full answer...
    Image 1 for
  • Best Rear Anti-Sway Bar for a 2018 Forest River FR3 30DS
    The correct rear anti-sway bar for your 2018 Forest River FR3 30DS is the Roadmaster Rear Anti-Sway Bar for Motorhomes part # RM-1139-146. Your coach has a gross vehicle weight rating (GVWR) of 18,000 lbs which is why this is the correct anti-sway bar for you. The Roadmaster Rear Anti-Sway Bar for Motorhomes part # RM-1139-145 that you referenced only works with coaches that have a 20,500 lb GVWR which would be the Forest River FR3 32DS.
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  • Rear Sway Bar Recommendation for 2015 Thor ACE Motorhome
    I recommend going with the Roadmaster Anti-Sway Bars for the Ford F-53 Chassis, # RM-1139-146. The bar on this anti-sway system mounts to the rear axle and to the frame of your 2015 Thor ACE motorhome to balance weight transfer, minimize sway, and reduce body roll. A rear sway bar upgrade is the biggest improvement you can make for the ride quality of a F-53 motorhome chassis.
    view full answer...
  • Recommended Front and Rear Anti-Sway Bar for 2018 Thor Hurricane 29M RV
    Your 2018 Thor Hurricane 29M RV is built on the Ford F-53 Chassis. For the front of your motorhome, I recommend the Roadmaster Front Anti-Sway Bar # RM-1139-148 and for the rear you can use the Roadmaster Rear Anti-Sway Bar # RM-1139-146. When installed and used together, these will do a fantastic job of minimizing sway and driver fatigue by improving the stability and driveability of your RV. There is not a sway bar from Blue Ox currently available that will fit your RV chassis. If...
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  • How to Pick Out Roadmaster Rear Sway Bar for Thor Ace 30.2 Rear Sway Bar
    In order to determine the correct rear sway bar for your 2017 Thor ACE 30.2 on a Ford F-53 chassis, you will need to take a look at the rear shock mounts. If the rear shock mounts have two holes and are parallel to the ground (see photo) then you will want to use part # RM-1139-145. If the rear shock mounts do not look like this then you are going to want to use part # RM-1139-146. I called my contact at Roadmaster to confirm this. I believe the shock mount difference is what your installer...
    view full answer...
    Image 1 for
  • Anti- Sway Bar Recommendations for 2017 Forest River FR3 30DS
    I did some checking and it looks like your 2017 Forrest River FR3 30DS is built on an 18k Ford chassis so for sway bars you'd want the # RM-1139-146 for the rear and then for the front # RM-1139-148.
    view full answer...

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Info for this part was:

Employee Mike L
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Employee Adam R
Expert Research:
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Employee Lindsey S
Edited by:
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Employee Jeff D
Installed by:
Jeff D
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Video Edited:
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Employee Chris R
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Employee Jonathan Y
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Employee Randy B
Test Fit:
Randy B
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