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  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-1129-124
Our Price: $708.85
You Save: $205.45
Anti-Sway Bars

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Shipping Weight: 44 lbs
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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-1129-124 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.
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Roadmaster Anti-Sway Bars - RM-1129-124

  • Anti-Sway Bar
  • Roadmaster
  • Rear
  • 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
  • Works with front anti-sway bar (sold separately) for absolute stability - available on certain applications only
  • 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.

1129-124 Road Master Anti-Sway Bar - Rear

Replaces 1129-123

Installation Details RM-1129-124 Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

Roadmaster Rear Anti-Sway Bar - 1-1/4" Diameter - RM-1129-124

Average Customer Rating:  4.8 out of 5 stars   (1821 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.

2004 Dodge Ram Pickup

This is on a 2004 Dodge 2500 with a 2500 lbs truck camper, Dirt bike on a hitch rack, and 2 mountain bikes on a front rack. The sway bar definitely helps. This one fit well around my stupid 5" exhaust that was installed by the previous owner. The Hellwig would not clear it. I have the Timbren SES and wedges in my leaf springs as well. The sway bar is a nice addition to those items. What I really notice is that when making emergency maneuvers or going off road, the truck corrects quicker than before and feels safer and less likely to tip over. I would not say the bar by itself will solve all of your issues, but couples with other remedies, it will help make your top heavy overloaded ride feel safer. With all my additions, I can confidently go the speed limit and often times well above through the Colorado mountains with no issues.

2005 Dodge Ram Pickup

Installation was straightforward and fairly easy to install. The instructions were clear which helped to get the anti-sway bar installed without any damage or incident during the process. What a difference it makes while driving. Great product.

2016 Ram 3500

Installation was an all day project. To install both upper brackets with the nuts welded to them I spent hours trying to get the 2nd bolts to thread into the welded nuts without cross threading them.
I've been a mechanical contractor for 30 years and these were one of the worst fitting parts I've ever worked with. I don't know if I got bad parts or or they're all this difficult to install on a 2016 Ram 3500 dually.
I will call Roadmaster to see what there explanation is for these parts.

Etrailer Expert

Katrina D.


It seems that these were in fact cross threaded. What problem we usually see is that if the threads are not lining up, people using an impact will not be aware of the cross threading and will install the bolts all the way, leading to further complications. However, it seems like you are not having that same type of issue. I have reached out to the manufacturer for you and they have said that this is not a common issue for this system. If you have already contacted Roadmaster, have you received information from the manufacturer about your specific situation?

2004 Dodge Ram Pickup

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.




Installation was as expected.
I have
not driven my truck with the camper on it or pulled my race car trailer.
Around the block empty the truck felt stiffer.



I drive a 1 ton diesel and pull a 8000 # trailer. This anti sway bar makes this combination travel with none of the previous uncomfortable problems. I wonder why my truck came without a sway bar. Recommend to other Dodge owners.

2005 Dodge Ram Pickup

This is the second Roadmaster rear anti sway bar I have purchased thru etrailer, again you will be hard pressed to find a better product than Roadmaster, fast shipping, quality product, easy install, and night and day difference when towing a heavy load. Installed on a 2005 Dodge Ram 3500 SRW. Thank you etrailer!

2017 Ram 3500

Installation went super well thank to the online videos. Took me less than 1.5 hours to install by myself. I used a spare tire to prop up the sway bar while getting each side bolted up. I installed it on a 2017 3500 Ram and we use a Arctic Fox 990 truck camper. It eliminated about 90% or more of the sway we experienced before. I would highly recommend this product.


This sway bar works great even with an 11-foot truck camper loaded on it.

2016 Ram 3500

This is beefy and fits like a glove (OJ'S I BELIEVE). The only thing that made the whole installation a .... nightmare was the complete lack of instructions and/or video with in-depth visuals. This is definitely a 2 person install, if nothing else to hand stackable hardware while you're holding everything in place. Once installed and road tested, I'm a believer, does exactly what it is designed to accomplish. Also, item showed in stock when ordered but still took well over a week to ship with no explanation??



Sold truck 2 months ago. Worked great with a Host Mammoth on its back

2005 Dodge Ram Pickup

Installed on 05 ram dually for slide in truck camper hauling. Huge improvement with sway, truck handles much better. East to install. Works as advertised and components and elastic components beefier than the well touted competitive product.
Travis S

Travis S.


Great... Works as advertised

2006 Dodge Ram Pickup

I recently purchased and installed a rear sway bar for my 2006 Dodge Ram 2500 4x4 diesel truck.. I searched through several models of bars but wanted one that was similar to the factory bar I had on my 2000 Dodge 2500 4x4. This Roadmaster bar is of excellent quality and bolts to the bottom brackets of the rear differential so the installation is very solid on the axle. The vertical links mount to 2 very sturdy brackets that attach to the frame rails. All the hardware is marked on the heads as graded hardware. The bars, links, urethane bushings and all hardware are excellent quality. This installation made an immediate improvement in my trucks roll stiffness. The factory does not make a rear roll bar for these year trucks for some reason. My previous Dodge had the camper package and came with a nice rear sway bar. This etrailer Roadmaster setup is a good option for anyone looking for something like a factory bar. The folks at etrailer were very knowledgable about their product and very helpful making sure I got the unit I needed. I will definitely recommend them and their products as well as use them in the future for my truck needs.

2016 Ram 3500

When attempting to install this I quickly realized that the arms were way too short. Called etrailer and was informed it was the right product for my truck. Called Roadmaster and after several back and forth calls it was determined that it would not work on my truck because it had after market airbags. Was never told that would be a problem. So now I’m sending it back and paying for a new box because the original was too damaged plus having to pay return shipping


This sway bar is a game changer was going to get rid of camper until I put the sway bar in works great! Best money I spent!

2010 Dodge Ram Pickup

Very happy with the sway bar. Make sure you have the frame brackets tight to the frame.

Larry G.


Still works well, does have clunk when you hit a bump. Talked with roadmaster and we could not identify cause. Make sure brackets are tight to frame, they will move.


Installing was easy and straight forward. I think it makes a difference in my towing and non towing driving. I like it very much


Like the online videos too


Everything fit worked as well has factory no complaints whatsoever


Easy install!



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.


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.


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.


OH My! If you are thinking about getting one for your P32 wide body. Please don’t hesitate. It REALLY Works. Take the white knuckle effect out of driving. EASY installation! Easy Ordering from etrailer. Roger helped me get through the buying process and shipped to my house in 2 days! Thank You!!


This sway bar is the real deal. Easy to follow instructions but I had it installed because I'm lazy. It took one hour labor


Replaced the anti-sway bar on our 2019 F350. No special tools or jacks needed for the installation. Now our Lance 850 truck camper doesn’t sway nearly as much as before. Big improvement. Very pleased!

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Info for this part was:

Employee Lindsey S
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Lindsey S
Employee Laura H
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Laura H
Employee Isabelle B
Updated by:
Isabelle B
Employee Sabrina W
Updated by:
Sabrina W
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 Wilson B
Written by:
Wilson B
Employee Jonathan Y
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Jonathan Y

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