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

Roadmaster Rear Anti-Sway Bar

Item # RM-1129-122
Our Price: $419.21
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. 1-833-496-1390 to order Roadmaster anti-sway bars part number RM-1129-122 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-1129-122

  • Anti-Sway Bar
  • Roadmaster
  • Rear
  • Steel w Polyurethane Bushing
  • 1-1/4 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
  • Made in the USA


  • Bar diameter: 1-1/4"
  • 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.

1129-122 Road Master Anti-Sway Bar - Rear

Installation Details RM-1129-122 Installation instructions

This Product Fits The Following Vehicles

Video of Roadmaster Rear Anti-Sway Bar

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Roadmaster Rear Anti-Sway Bar Review

Hey there, heavy haulers. Today, we're going to take a look at the Roadmaster Rear Anti-sway Bar for Trucks. You can use our fit guide to find the right sway bar for your truck. This is what our sway bar looks like when it's installed. You can tell that it's significantly larger than our factory sway bar. This is what our old sway bar used to look like right here.

There's just really no comparison on how much thicker and stronger this sway bar is. This one here, I can't bend whatsoever. This guy, it was providing some support and I know I'm pushing it together, which really isn't how sway bars work. They work in a twisting motion, but this one is significantly smaller and is going to provide not nearly as much anti-sway as our stronger, larger bar here.The main purpose of upgrading to a larger sway bar like this is to help minimize sway. As you're going down the road and you make turns or evasive maneuvers, the body wants to roll.

As that rolls, it kind of throws you around in the cabin and makes it more difficult to maintain control of the vehicle. Also, when it sways, it shifts weight in a direction which could cause the vehicle to start to pull or slide in that direction. By minimizing the sway, it just helps stabilize the vehicle and provide you with more control and stability. Having a larger bar here is going to do just that for you.Also in this kit, you're going to receive new bushings, shackles, and hardware. So if you've got an old sway bar that's just got worn out bushings and you're looking to just repair it and you're wanting to upgrade it to have less sway, to be able to haul heavier items without feeling it throwing your truck around when you're going around those turns, this kit comes with all those components too.Let's go ahead and get a baseline measurement and we're going to hit the test course with our factory sway bar on there.

First, we're going to be in the bump section, which is going to simulate a pothole. The rear end does make quite a bit of noise and it doesn't feel that tight. There's a lot of back and forth rocking going on. Lastly, we're going to be going into our slalom section and this is going to simulate an evasive maneuver. On our slalom course, you can really feel how loose the truck is as we weave back and forth.

It's honestly a little scary to drive this, performing these big evasive maneuvers, so I can only imagine what it would be like if our truck bed was fully loaded.Now that we've got the new sway bar installed, I'm going to go ahead and take it out on the test course and we're going to see how it compared with our factory results. First, we're going to be in the bump section, and as we go over these bumps, we can definitely tell there is less rocking back and forth. It does seem to stiffen the vehicle up a little bit, so if you're concerned about having a smoother ride, this isn't really going to make it smoother, but this is really designed for those guys hauling heavy equipment so it's going to be more beneficial for them. Next we're going to be heading into our slalom section, and this is going to simulate an evasive maneuver. During this section, this is where I expect to see the biggest improvements as our sway bar is considerably larger than our old ones. So when we head up here, we're going to go ahead and start ripping her back and forth. Oh yeah, it definitely . wow, it really grips pretty good. It's actually pretty fun to drive. Considerable improvements over your factory components.In the end, upgrading your truck's rear anti-sway bar lets you execute turns and quick maneuvers with confidence, while reducing driver fatigue and minimizing the effort required to keep your vehicle in line due to crosswinds, passing motorists, and large shifting cargo. The 4140 chromiley 00:03:32 steel is going to be considerably harder and stronger than your factory installed sway bar. If you're concerned about up and down motion or your vehicle sagging down in the back, I suggest upgraded jounce bumpers or a set of airbags. That completes our look at the Roadmaster Rear Anti-sway Bar for Trucks.

Customer Satisfaction Score:

Customer Reviews

Roadmaster Rear Anti-Sway Bar - RM-1129-122

Average Customer Rating:  4.8 out of 5 stars   (1318 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.


Considering the difference in diameter from stock to this upgrade I could feel the difference while driving. Easy to install with one minor obstacle. The factory left drop link bolt was installed between the fuel tank and the link mount which required us to remove the rear fuel tank bracket and pull the tank out far enough to pull the factory bolt out. The new bolt was installed towards the tank. Installed on ‘99 Dodge Ram 2500 4x4.


The hardware itself deserves 5 stars. The installation instructions deserve 1 star. Very poor instructions: wording less than clear, some components have been changed since they were written, and the pictures are very poor - in fact, the pictures were of a stock installation rather than the system sold. No torque specs given even though a torque wrench was listed as a required tool.

The manufacturer recommends contacting the dealership for the correct torque settings.
-- Etrailer Expert Jenny N - 04/04/2022


As usual etrailer comes through with an excellent product and great customer service.


excellent product


thicker than a bowl of oatmeal, tighter than a clams ***, significantly better than stock. Can't wait for the front to arrive

Dodge Ram Pickup

I did a fair amount of research before buying this Roadmaster rear sway bar setup. I like the fact that it attaches to the truck using factory axle holes (in my case, the holes below the shock mounts on the rear axle of my '00 Ram 3500 DRW) and that it clears my 4" exhaust piping with ease. We tow a 37' Travel Trailer with this truck and the Roadmaster sway bar has made a noticeable improvement in the ride quality.


It’s been a few weeks since I did my research and have thrown away my notes.. I chose the Road Master over the Hellwig because the Roadmaster is thicker. I can’t remember the exact dimensions but I do know the Roadmaster is thicker.. I have a truck camper with Air bags installed and I was going down the road swaying side to side like a boat in the ocean.. When I took the stock anti sway bar off and set it besides the Roadmaster Anit Sway Bar, the Roadmaster is twice as thick as the stock.. Haven’t got to go camping yet due to Coronavirus Shelter in place but I can tell just by looking I made the right decision...


The package arrived very promptly and in good condition. Next day I installed the roadmaster sway bar on a dodge truck that I haul a 10.5 camper. I'm pretty much at the truck weight limit. What a difference!. Where often I felt on the verge of going out of control now feels steady and secure. curvy hilly roads were the worst but now much better. On freeway semis passing would sway me to the far side of my lane and then upon passing suck me back. Now again greatly improved. Looking forward to my next trip!!

1998 Dodge Ram Pickup

Everything lined up on my 98 Ram 3500 and it made a noticeable difference in sway with a camper in the bed.


this product gets the job done when towing heavy loads

2001 Dodge Ram Pickup


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

The Roadmaster Anti-Sway Bar is of excellent quality. All of the parts are heavy duty and fit exactly the way they should. I have a 2003 Fleetwood on a Workhorse W22 chassis and considering the age all of the factory bolts and nuts came off without any issues. Installation was easy following the printed instructions and the online video. I really recommend this product.


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

I installed the front and rear Anti-sway bars with the steering shock.
I am 100% satisfied with the outcome and handling of my RV while driving down the road.
I would highly recommend the installation of these items on any RV

You just cant go wrong installing these kits to you RV. Next thing i looking to install is the air suspension kit and new shocks.
marcus - 09/21/2021


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

Was an fairly easy install with two people , has held up well so far . Helped stop sway with my top heavy truck camper load. At the time it was the only sway bar that fit the ram 3500 with 6.4 gas hemi due to exhaust system interference with other brands .

Sway bar has held up well since installation.
Michael - 06/07/2022


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

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.

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.
Jose - 12/13/2021


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

This is one of the best upgrades I have made to my 2016 F350 dually. The vehicle handles noticeable better while towing as well as without a load. I bought this stabilizer to help with body roll when cornering while towing my 19,000 lb 5th wheel. But I was surprised how well handling improved with an empty truck while driving down winding country roads. My truck now corners better than my wife’s Ford Escape (not exaggerating this). I state this a year after making this upgrade. If and when I buy a new truck, this will be one of the first upgrades I will make.

Still amazed at how well this anti sway bar improves the handling of my 2016 F350 DRW both while towing and unladen.
RV t - 10/16/2022


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

Easy installs on my 2004 E-450. The new Roadmaster 1139-115 front sway bar and the Roadmaster 1139-147 rear sway bar greatly improved the handling and cornering of the motorhome. I have aDraw-Tite 65001 front mount receiver mounted and there were no problems when installing the front sway bar.

It is actually a pleasure to drive! When cornering the motorhome would lean and things would slide around and i even had kitchen drawers open. The problems that i had no longer exist. The cost and the work i did to install were well worth it!
Andrew - 06/18/2021


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

Relatively easy installation on my 2004 Ram 3500. It would have been easier if I had removed the spare tire. I only noted a few minor issues. The instructions say to mount the U brackets to the rear two holes in the shock mounts. However, on this truck the shocks mount one in front and one in rear. Therefore, the passenger side mounts in the rear two holes, but the driver side mounts in the front two holes. Otherwise all went well.

Dale C - 12/18/2021


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

Très satisfaits de mon achat, avec mon campeur bigfoot la différence est notable

(Very satisfied with my purchase, with my bigfoot camper the difference is noticeable)


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

Last year I installed the Sumo Springs (lighter load rated) front and rear and rear Koni FSD dampeners which helped noticeably on my 2017 Winnebago View 24J by stabilizing the ride.
I finally installed the Roadmaster rear anti sway bar RM 1209-120 immediately after receiving today. Absolutely worth the low cost for the major improvement in ride comfort and stability. These are direct bolt on replacements for the OEM Mercedes part and utilize the stock mounting bracket hardware.
For a total of less than $xxx I have completely transformed the ride of my Class C motorhome.


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

I’ve been procrastinating for years, I should have donne this modo à long long time ago. What a difference it made on my Kodiak based RV handling. Stop putting it off Do it now, you won’t regret it.

A year ago we installed a front Sway bar and Davis trueTrack. The combination of these component greatly improved the stability of our Super-C Motorhome. Strongly these components if you have stability issues with your RV.
Daniel S - 08/05/2022


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

Significant difference when making turns and going around curves. These twin I beam suspension have a tendency to follow uneven road surfaces, this pretty much eliminated a lot of that. Installed it myself with the Roadmaster end links and the only complaint I have is I had to enlarge bolt hole for the end link bolt, other than that, well satisfied. I also installed the rear sway bar at same time, highly recommend replacing the front and rear sway bars together.


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

Delivery was fast and great.Paula S is a very excellent person to have working for your business She was very helpful in helping me out getting the right parts and fun to talk to. Thanks again for your help.


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

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.


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

Definitely a big difference in the drive! I was expecting longer bolts that hold the sway bar.

Show More Reviews

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

  • Rear Axle Anti-Sway Bar for 1999 Dodge Ram 3500 Extended Cab Dually
    The Roadmaster Rear Axle Anti-Sway Bar # RM-1129-122 that you referenced is a correct fit for the 1999 Dodge Ram 3500 extended cab 4-wheel-drive dually. I verified the fit of this kit on your truck with my technical contact at Roadmaster. This will not fit 2WD versions. This anti-sway bar installs without drilling since it replaces the factory sway bar.
    view full answer...
  • Rear Sway Bar Recommendation for 1999 Dodge Ram 2500 with Camper
    A rear sway bar will help greatly with the body roll you are experiencing with your 1999 Dodge Ram 2500. For that you'd want the Roadmaster sway bar part # RM-1129-122 which is a confirmed fit and designed for your situation.
    view full answer...
  • Best Suspension Upgrade for a 1999 Dodge Ram 2500 with Arctic Fox Truck Bed Camper
    For your 1999 Dodge Ram 2500, I recommend replacing the rear sway bar first since the majority of the added weight is placed on the rear suspension. Adding a front or rear sway bar will not affect the ride quality. The Firestone airbags you have work great for helping to evenly distribute the added weight but will not compare with an upgraded sway control bar as far as reduced body roll goes. I recommend taking a look at the Roadmaster Rear Anti-Sway Bar part # RM-1129-122. The Roadmaster...
    view full answer...
  • Does Install of Roadmaster Swaybar on 2002 Dodge Ram 2500 Require Drilling
    The Roadmaster rear sway bar part # RM-1129-122 is a confirmed fit for your 2001 Dodge Ram 2500 4WD, it replaces the factory sway bar, uses factory mount locations and does not require drilling. It wasn't tested with aftermarket 4 inch exhaust but looking at how the exhaust routes on your vehicle and the location of this I do not believe it would be an issue. Removing the tank bracket is sometimes required to access the bolt. It's not as difficult or challenging as it may sound like though.
    view full answer...
  • Will Upgrading Rear Anti-Sway Bar Help Reduce Body Roll on a 1999 Dodge Ram Pickup
    Upgrading the rear factory anti-sway bar with # RM-1129-122 will help reduce side to side body roll. This bar fits 2500 and 3500 series 4x4s only. Other option to reduce body roll is to install some suspension helper springs. If you have a 4x4 with standard height (no factory or aftermarket lift) I recommend # TDR1525H4 which will fit a 1500 or 2500 but not a 3500. For a 3500 use # TDR3500 for a 4x4 or # TDR3500B for 2-wheel drive models. For a 1500 with standard height and 2-wheel drive...
    view full answer...

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Info for this part was:

Employee Lindsey S
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Employee Michael H
Expert Research:
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Employee Jeff D
Installed by:
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