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  1. Anti-Sway Bars
  2. Roadmaster
  3. Anti-Sway Bar
  4. Rear
  5. 1-1/8 Inch Diameter
  6. Mounting Hardware Included
THIS ITEM IS NOT A FIT FOR
2021 Jeep Cherokee
Roadmaster

Roadmaster Rear Anti-Sway Bar - 1-1/8" Diameter

Part Number: RM-1209-117
In Stock
$670.00
Retail:$743.07
You Save: $73.07
Anti-Sway Bars
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2021 Jeep Cherokee

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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-1209-117 or order online at etrailer.com. Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster Rear Anti-Sway Bar - 1-1/8" Diameter. Anti-Sway Bars reviews from real customers.
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  • Reviews (2530)
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  • Videos (2)
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Roadmaster Anti-Sway Bars - RM-1209-117

Highlights

  • Custom Fit for Your Vehicle: Tuned to your suspension for better control and stability.
  • Reduces Sway: 1-1/8" rear bar balances weight transfer to cut side-to-side body roll.
  • Handles Crosswinds: Keeps your rig steady against gusts, passing traffic, and shifting cargo.
  • Less Driver Fatigue: Smooths steering response so long trips feel more controlled and relaxed.
  • Improves Cornering: Lets you take turns and uneven roads with better stability and predictability.
  • Durable Build: 4140 chromoly steel and polyurethane bushings provide long-lasting strength.
Made in USA

Features to know about

Tighter Handling Through Turns: Rear Bar Balances Weight Transfer

Nothing throws you off like feeling the rear of your rig lean through a curve. The Roadmaster Rear Anti-Sway Bar mounts to the rear axle and chassis to balance weight transfer and cut down on body roll. The 1-1/8" diameter 4140 chromoly steel bar ties everything together so the vehicle stays level and composed through corners or quick maneuvers.

Less Fatigue on Long Drives: Stable, Predictable Ride

Fighting crosswinds or being pushed around by passing traffic can wear you out fast. This setup minimizes side-to-side motion so it takes less effort to hold your line. The bar uses the weight of the axle to brace the frame when it shifts, keeping the ride steady even on uneven pavement or in gusty conditions.

Heavy-Duty Strength: 4140 Chromoly Steel and Polyurethane Bushings

Built from 4140 chromoly steel, this bar is tougher and stiffer than standard 1020 steel versions. The larger diameter increases roll stiffness by nearly 30 percent, giving you stronger resistance to sway. Polyurethane bushings replace the usual rubber, resisting oil, gasoline, and ozone so they stay firm and supportive over time.

Straightforward Install: Bolt-On Hardware and Lube Included

No drilling required. The system includes heavy-gauge mounting hardware, easy-to-follow instructions, and bushing lubricant. It’s engineered to avoid interference with most popular aftermarket suspension add-ons, making it an easy upgrade that fits right in with your existing setup.

Specs

Dimensions

  • Bar diameter: 1-1/8"

Warranty

  • Limited Lifetime Warranty:

1209-117 Road Master Anti-Sway Bar - Rear

Installation Details RM-1209-117 Installation instructions

This Product Fits The Following Vehicles




Video of Roadmaster Rear Anti-Sway Bar - 1-1/8" Diameter
Video Thumbnail Video Player Dialog

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




Video Transcript for A Closer Look at the Roadmaster Rear Anti-Sway Bar

Speaker 1: Today we're gonna be taking a look at Roadmaster's Line of Rear Anti-Sway Bars for motorhomes. You want to refer to our fit guide to find the appropriate sway bar for your vehicle.The large size and heavy weight associated with motorhomes can cause drastic amounts of sway when driving down the road. To help create a safer ride, and reduce driver fatigue, we can minimize the sway by adding an additional rear sway bar. So when making basic maneuvers or sharp turns, you'll minimize the risk of a rollover.Also, when driving on windy days, on uneven pavement, you can get a sway affect going back and forth, and you'll have to compensate for that with the steering wheel to maintain and safe, straight path.This additional bar will help reduce that amount of sway, making it easier to maintain control of your vehicle and reduce vehicle fatigue, 'cause you're not having to compensate as much.The Polyurethane Bushings will help dampen road vibrations, and additionally stand up to corrosive road oils, salts, and UV rays. The bar is made up of 4140 chrome steel, where most factory bars are only made of a lower strength, 1020 steel.And to maximize your reduction of sway, Roadmaster recommends you also get a front anti-sway bar. Using our fit guide at etrailer.com you can pick out the appropriate rear and front end anti-sway bars for your motorhome.Now we'll take our anti-sway bars out on our test course.

When we go into our alternating bumps, you can instantly feel a difference in the amount of sway. It's a lot more stable side to side then it was before, making it much easier to maintain control of the steering wheel.And then we'll head onto our straight bumps. When we hit those, there's a definite difference in how much forward and back movement than we had before. It's definitely a more comfortable ride than what we had. And again, it's easier to maintain control of the steering wheel.And now we'll head onto our slalom where we can really test our the sway capabilities.

So if we have some evasive maneuvers, how our motorhome would react. And it's a massive difference. When turning, there's hardly any sway. I feel much more confidence taking sharp, evasive turns.Our customer David S purchased both front and rear Roadmaster anti-sway bars, and had this to say."I installed front and rear sway bars on my 2006 Itasca Suncruiser after making a winter trip to Florida from Ohio. We made a return trip this past winter, through the smoky mountains etcetera.

The improvement in handling was so noticeable, my wife noticed it from the passenger seat. I highly recommend both of these products. I have a workhorse w24 chassis. Crosswinds and semi-push was very minimal. One handed driving in most situations in the norm now, and driver fatigue was minimal.

Driving the coach is much more enjoyable."And that completes our look at Roadmaster's line of rear anti-sway bars for motorhomes.

Customer Satisfaction Score:

Ratings & Reviews

4.8

2530 reviews
5 Stars
(2163)
4 Stars
(253)
3 Stars
(48)
2 Stars
(22)
1 Star
(44)
Review Sort Icon
by:
2004 Mercedes-Benz Sprinter
I chose this product over other options because I was able to install the unit at the original location on my 04 Sprinter 2500. The improvement was excellent. I was having swaying problems on the highway, to the point of almost losing control of the van when being passed by trucks and larger vehicles. I also replaced the front bushings and links. This combination corrected my issues to the point that I had forgotten about them until this review request was sent to me from etrailer. I would recommend this product and am very pleased with the result
by:
2015 Mercedes-Benz Sprinter
2006 Sprinter. Replaced factory 22mm bar with this 33mm bar. Instantly noticed a reduction of Van leaning from winds by 80% to 90%. There is still some buffeting in cross winds over 15 mph. The Sumo bump stops were installed 2 years prior to new swaybar used in conjunction.
by:
2006 Dodge Sprinter
Bar will fit, not without many modifications to brake system. Also brackets are too narrow for socket to tighten. Spent hours getting it all to work, seems to be good from the little I have tested it.
by:
Effective and easy to install. Missing an extra star (to make it 5) because new fasteners (9.8 or 10.8) were not included for the ‘rod to frame’ straps. Should be included, both for the product price and the location of the joint being fastened.
by:
Just what I needed!
by:
by:
2006 Dodge Sprinter
by:
by:
2013 dodge Ram Pickup
Great instructions and nice, high quality fasteners.
Fitment was great and only minor adjustments to my Air lift air bags was needed.
I have a 2013 Ram 3500 Dually with:
-Torklift 30K hitch
-5” Exhaust
-Air lift 7500XL air bags.
The lower brackets for the air bags needed to be moved slightly and I had to cut the excess bolt off on the passenger side.
Matthew profile picture

Matthew

10/7/2026

This is a complete game changer when using a truck camper Mine is an Arctic Fox 990. I would list this under a must have accessory when using a truck camper. Unloaded ride when you hit off camber bumps is slightly rougher, but hey its a Ram 3500 dually for hauling heavy stuff. Also the performance when carving twisty canyons with an empty truck is astonishing....Watch out Corvetts, here I come!

Jameson C. profile picture
Etrailer Expert

Jameson C.

10/7/2026

@Matthew great to hear! I am glad it's working well for you!
by:
Excellent high quality product made a big difference in handling with heavy Artic Fox camper
Give poor rating regarding installation instructions
Fred profile picture

Fred

8/15/2026

Excellent it works great

Jerred H. profile picture
Etrailer Expert

Jerred H.

8/16/2026

@Fred That's great to hear Fred! Thanks for coming back and sharing that feedback!
by:
RM-1109-121 Rear Sway bar for 85 Chevyvan G30 RV. Install was pretty straightforward. I would mount the brackets to the frame first and then the sway bar to the axle. It’s easier to drill the holes without the sway bar getting in the way.
Before I replaced the shocks and upgraded the from sway bar and added the rear sway bar my G30 Chevyvan Winnebago was a wallow wagon. It took 110% focus to drive. Now it drives like a regular vehicle. Smooth. No leaning over when cornering. It’s night and day.
Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

4/8/2025

No more white knuckling! That's awesome to hear, Kris. I'm glad that this bar helped so much so you can have a more relaxed drive :)

Kris profile picture

Kris

3/17/2026

I have taken a few trips with the Clatter Cabin now. It’s been enjoyable to drive. Since then I have replaced the exhaust from the engine back with 2 12 inch pipe. I was able to get the pre bent exhaust parts over the axle and clear your rear sway bar nicely. Now she purrrrs!

by:
I have carried a truck camper for 7 years with just Timbrin blocks also from Etrailer and finally made the move to Roadmaster anti sway bars front and rear. Planning a trip to the west coast from Georgia next year and wanted all the help I can get for stability on the mountain roads. Have yet to test but Im sure it will be a noticeable improvement. When my wife takes the wheel so I can have a break she would see-saw the steering wheel to balance the load and it drove me insane. Hoping for relief for both of us.
Kate F. profile picture
Etrailer Expert

Kate F.

9/24/2025

Install looks great Steven! I can't wait for you to take it out for a spin so you can see the difference for yourself, it is amazing what a upgraded sway bar does to your ride, no more white knuckles for you, or your wife. What big stops do you have planned on your trip to the West Coast?

by:
2025 Ram 2500
2025 Sprinter 2500 low roof WITH factory sway bar. Added this bar to control the terrible handling at the rear of these vans and it absolutely takes care of that. Be aware that you 100% need the retro-fit kit for this bar to be installed as the factory sway bar end links will NOT work. The retrofit kit that you need is the RM-590064-00.
by:
2007 Ford F-250 Super Duty
Great buying experience with ETrailer. Fast shipping and quality constructed part. Noticeable difference in controlling body sway. Very pleased with the bar and highly recommend Etrailer.
Ken profile picture

Ken

8/19/2025

No complaints with the handling. This is a good sway bar!

by:
After about a year with both the Roadmaster Rear Anti-Sway Bar and the TorkLift StableLoad Upper Overload Spring Upgrade on our truck camper setup, my experience has been mixed.

With the StableLoads, some of the mounting screws eventually fell out. I contacted etrailer expecting the issue to be handled under warranty, but instead of taking care of the replacement directly, I was referred to the manufacturer. Considering the age of the product and that it was purchased through etrailer, I was disappointed with how the warranty issue was handled.

As for the Roadmaster 1-1/2" rear anti-sway bar, it is a very solid and well-built product, but in our particular application I honestly haven't noticed a major difference in body roll while taking turns with the camper loaded. I have driven the truck both with and without it, and the improvement was much less noticeable than I expected.

Neither product is necessarily bad, but based on our experience, the improvement in handling hasn't been significant enough for me to strongly recommend them given the cost.
by:
2012 Ford F-350 Super Duty
I prefer to purchase direct from most manufacturers due to tech support and service. However I find myself purchasing from etrailer.com more and more due to the positive experience, expert tech chat advice, fast shipping and great prices to name just a few. It makes all the difference knowing that you are communicating with a real person and not AI. The Roadmaster 1 3/8” rear sway bar has been my most effective purchase for my truck to date. The SuperSprings SuperSway Stops are right up there in effectiveness as with the rear sway bar. The rear sway bar and SuperSprings SuperSway Stops were very easy to install and I feel like I am driving a different truck. In combination, the two purchases have made the truck and camper feel like one vehicle; no longer does it feel like a truck with something in the bed. VERY stable on turns, twists, hills and angles. I cannot recommend these products enough.
by:
2022 Ford E-Series Cutaway
Received the product in a timely manner. The shipping company used I’d give a no star rating. I received the anti-sway bar bare out of a box or wrapper with the installation part box and a cut out piece of cardboard with the shipping label on it taped to the bare bar with about five yards of packing tape. The bar was scuffed, scratched and chipped with the RoadMaster label destroyed. I realize it’s going to be installed under the front of my motorhome but as much as it costed I would like to be the one to scratch and scuff it. If I was a company installing this on a customers vehicle I’d return it. I do not believe it was shipped from etrailer in this condition.
Jenny N. profile picture
Etrailer Expert

Jenny N.

6/25/2024

What I recommend is touching it up with a rust resistant paint like Rustoleum. We will be in contact with you about the damage. Please keep an eye on your email.

Leonard profile picture

Leonard

6/22/2025

After a year and many miles I would give it a five star for sure. Made a great improvement over the stock anti-sway bar. With the rear and front RoadMaster anti-sway along with the RoadMaster steering stabilizer the E-450 33 foot class C motorhome drives like a dream. I highly recommend these three products. If not all at once then this order, 1st rear anti sway bar then 2nd front and then the steering stabilizer with the spring on it.

by:
I installed this on a '96 Dodge W3500. It was a new install because the truck didn't come with a factory sway bar. The product is well built and very sturdy. However Installation was problematic. There weren't any bolts included for the upper link mount. All the other required hardware was included but not that. Come on guys. Over $550 and you can't include another $15 worth of grade 8 nuts and bolts? My nearest hardware store is over an hour away! Also the 1/2" bolt on the driver's side upper link is too long and hits the fuel tank so I shortened it.
After the installation the truck rode noticeably better with a Lance 915 camper on the back. Roll was a lot more controllable.
I would have rated it a 5 except for the frustration of having to waste half a day on a trip to the hardware store.
by:
The anti sway bar is a big improvement when the truck bed camper is on. The installation took a bit longer than expected because the frame brackets don’t fit around an aftermarket B&W gooseneck hitch. I had to fabricate new top brackets and drill out the bottom brackets to widen the bolt pattern. Keep this in mind if you have a gooseneck hitch.
by:
a quick fix it to install sway bars front and rear.
I did this and just came home from 2400 mile trip.
installed rear only before we left, then at our destination installed front.
the drive back it handles wayyy better and it sits level now.
""your results may very-use at your own risk. ""
from etrailer.com
rear = RoadMaster 1259-109.
front = RoadMaster RM-1259-105 with RM-590063-00 bracket kit.
i'm sure over time they will flex and stress and start to lien again.
But for now it looks much happier. ( and level )
and i'm very happier with performance and drivability
Seems the big bars help distribute the load to both sides,
you can drive it with one hand now.
and when a truck passes, it's very manageable.
( this could be part the tires on it )
these can be installed in about 6 hours pretty easy.
The hardest thing is drilling the 8 holes in frame. ( 4 front 4 rear. )
We had to shift 2 brake lines over via and small bracket and covers lines with old fuel like to act as wear buffer.
Dan K. profile picture

Dan K.

4/22/2026

wondaful! highly recommended.

by:
2022 Ford F-350 Super Duty
After waiting 3 weeks the swaybar kit was drop-shipped from the factory. Received and discovered the bushing inserts were the wrong size (too small) for the bolts that were sent. Contacted Roadmaster support and provided them a photo and invoice as requested. The replacement inserts were approved and shipped out. I got metric bolts to go with the inserts I received. I will save the replacements for additional replacements.
The install was fairly straight forward.
Haven't had a chance to tow the 5th-wheel yet.
by:
The products itself is good. Works well. But you would think when you spend $800 for something, the directions could be very detailed. There could be a complete video of it being installed. They don't give you specs for torquing any of the bolts and some very lousy pictures with a small amount of instruction. You can do better Roadmaster you want to charge me a lot of money for something then give me great detail on in installing it as well.
by:
This is a must have for your Motorhome. What a difference in the ride of the coach through the highway washes, the side winds and the side drift of the big rigs. This bar reduces the coach movement by as much as 80% I would say. The installation is easy for someone who is mechanically inclined and still doable for DYIer as long as you have the tools ( standard 1/2” drive tool set, low speed high torque drill for the holes in the frame and a 250 plus ftlbs torque wrench). I would highly recommend this Anti-Sway Bar.
Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

4/28/2025

High-five on the install, Curtis! Also, thanks for sharing all the pictures and showing all the angles of the sway bar. They are really helpful for anyone looking to tackle this install themselves at home!

by:
2019 Forest River Georgetown 5 Series GT5 Motorhome
you guys did great package was damage RM-1139-149

Roadmaster Rear Anti-Sway Bar - 1-5/8" Diameter the sway bar itself
by:
Grate stuff. Easy to bolt up and figure out. Drive quality improved dramatically and less sway with trailers.
Just in the kit with the grease and red lock tight the hardware washers were one size to large so I got the right ones and installed all is well.
Brooke M. profile picture
Etrailer Expert

Brooke M.

6/17/2025

So glad to hear that, Dimitrios! Thanks for including a photo, too.

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Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B
Employee Sabrina W
Updated by:
Sabrina W
Employee Dustin K
Video Edited:
Dustin K

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