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

Roadmaster Rear Anti-Sway Bar - 1-1/4" Diameter

Item # RM-1129-122
Our Price: $444.76
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.

Add to cart
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. 1-800-940-8924 to order Roadmaster anti-sway bars part number RM-1129-122 or order online at Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster Rear Anti-Sway Bar - 1-1/4" Diameter. Anti-Sway Bars reviews from real customers.
  • All Info
  • Reviews (1928)
  • Q & A (0)
  • Photos

Roadmaster Anti-Sway Bars - RM-1129-122

  • Anti-Sway Bar
  • Rear
  • Roadmaster
  • 1-1/4 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
  • 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

Customer Reviews

Roadmaster Rear Anti-Sway Bar - 1-1/4" Diameter - RM-1129-122

Average Customer Rating:  4.8 out of 5 stars   (1926 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.


Outstanding performance upgrade for a heavy truck camper. Night and day difference. Larger than the bigwig for 94-02 rams. Handles my arctic fox 990 much better now. Complimented the recent 19.5 upgrade great!

2001 Dodge Ram Pickup

2001 Dodge Ram 2500. All good except one frame bracket hole was 7/16th's instead of 1/2", the manufacture date on the two mounts was 1 year apart so evidently they changed to 1/2", VERY inconvenient when you live 20 mi. out of town and your truck is dismantled! Parts seem well built. Take it easy on the grease, by the time I was done I had it from one end to the other. 4 hour job alone in the driveway.


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.


UPS screwed up the address change request so the bars were returned and we were charged a restocking fee of $[XX]. UPS took no responsibility for their mistake-- etrailer refunded the fee and sent my parts. 2 hours of fighting with UPS was resolved in 5 minutes by etrailer. Thanks


5 it was great!

1998 Dodge Ram Pickup

The bar fit nicely. The brake proportioning valve bracket had to be modified and the hole elongated. The performance with the camper on is night and day difference on my 1998 2500 Ram.


First off if your looking for a rear anti-sway bar do not hesitate to purchase a Roadmaster...QUALITY! hardware, paint, grommets, welding, the whole package top shelf! Install went well, test drive went well no more body roll, shipping was quick. Paul B. and etrailer made it easy thanks again for a great product!


Our camper is way easier to drive with the sway bar. The whole truck is so much steadier . Thank you!!


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.

Etrailer Expert

Jenny N.


The manufacturer recommends contacting the dealership for the correct torque settings.

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.

1999 Dodge Ram Pickup

Great customer service sway bar was a Easy replacement for factory sway bar Great quality installation 1999 ram 3500 4x4


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.


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


excellent product


this product gets the job done when towing heavy loads


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

2001 Dodge Ram Pickup


I have a 2017 Ford F350 Super Duty SRW, and we haul a heavy truck camper (Lance 1055.) I have Stable Load Uppers and HD airbags, but wanted to add a sway bar to add that extra layer of control, even though my truck has handled the camper well over the last 2 years and 10,000 miles. My truck did not come with an OEM sway bar installed, so I needed this kit that included the End Links too.

The Roadmaster Rear Sway Bar and End Links sold on etrailer are top quality products. They are robust and well made, with quality hardware to match. The product deserves a 5-star, and even unloaded, my truck handling improved right after installation, with improved cornering and no real impact on ride quality in my opinion. I have not yet loaded up our camper or towed our boat, but I have no doubt this sway bar will substantially reduce sway and will improve control and handling when the camper is loaded.

So why 4 stars and not 5?

1. I researched this product and the installation in detail. I planned on installing it myself and expected to find plenty of detail on etrailer's site, or Roadmaster's site, or the internet. My most pressing question was about where to mount the end links, and the orientation of the sway bar arms since I wouldn't be using the OEM end links. That information was no where to be found on the etrailer site, Roadmaster's site, or in any installation manuals. For a product and supplier that has likely sold lots of these to Ford Super Duty owners, I was surprised to find how little info was out there. The installation video on the etrailer site was helpful, but did not include any information for the end links, as they had a 2015 Super Duty and used the OEM end links already installed. I contacted etrailer and they told me to contact Roadmaster for more info on where to locate the end links with this kit.

2. I contacted Roadmaster. They told me they had no instructions and that despite my truck already having the cut-outs for the OEM bracket that attaches the OEM end links to the frame, that none of those holes may work for me. So they suggested I connect the sway bar brackets to the axle first and then see where the arms would line up with the end links. The tech also suggested that it wasn't critical that the end links were perpendicular
to the frame, but that I should try install the end links to allow the arm of the sway bar to hand as close to parallel as possible. No bueno. When I installed this the 14" end links (center hole to center hole) didn't allow for the arms to hang parallel to the frame. And I don't think it matters as the orientation of my sway bar and the arms looks about like every video or picture I could find on the internet of this year/model truck and this sway bar kit. It seems to function fine.

3. Installing it was a bear, especially the way they instructed me to. And I had to make some modifications to fit my truck, as the sway bar arms were rubbing up against my airbag mounting brackets. I got it installed, but the thin instructions turned what should have been a 60 minute job into 2 1/2 hours. A bit frustrating.

All in all, this will do the job intended and will provide me with peace of mind next time we load our camper. I am a bit frustrated that there were zero installation instructions specific to my year/make/model of truck given it did not have an OEM sway bar and the end links had to be installed with a bit of guesswork. You will also note in my pictures that I had to mount the end links to the sway bar arms differently on each side to make the bar fit around my air bag mounts.


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.


This product arrived on time, and is as described in company literature. I have installed the sway bars and the sumo springs on my 2019 Ford E3 26 foot Thor motorhome. Installation is fairly straightforward. Having said that, I am a retired farmer and I am quite familiar with this type of work. Having the proper tools makes the job go much quicker and easier. Installation of the front sway bar took a little under an hour. The rear sway bar is a bit more complicated to install, but he can be easily accomplished by someone of average mechanical skills, equipped with the proper tools. I strongly recommend removing the rear wheels to facilitate installation of the springs and the sway bar. I have not driven my motorhome yet, but will be taking an extended trip in March. I am looking forward to an improved ride.


All the contents were delivered in the package. The kit fit perfectly as designed. Ordered for a Ford F-350 Super Duty. Truck handles great!


Was told from etrailer that this was going to be a quick plug and play but no this was to be installed on a class c ( no drilling) but no , ustraps had to be adjusted did not fit and struts would not reach had to drill chasis


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.

Show More Reviews

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

  • 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...
  • 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...
  • Is An Anti-Sway Bar Recommended For A 1998 Dodge Ram 2500 Hauling A 2000 Lance 1010 Truck Bed Camper
    Yes, adding a rear anti-sway bar on your 1998 Dodge Ram 2500 will make a major difference in your vehicle's handling while hauling your truck bed camper. Truck bed campers are very top heavy and can cause side-to-side sway so an anti-sway bar will help keep you upright on the road. For a 1998 Dodge Ram 2500 you would need the Roadmaster Rear Anti-Sway Bar # RM-1129-122.
    view full answer...

Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Jeff D
Installed by:
Jeff D
Employee David F
Installed by:
David F
Employee Dustin K
Video Edited:
Dustin K
Employee John S
Video Edited:
John S
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B
Employee Sabrina W
Updated by:
Sabrina W
Employee Jonathan Y
Video by:
Jonathan Y

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.