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

Part Number: RM-1129-143

2530 Reviews | 12 Questions

$670.00

Retail:$745.86

You Save: $75.86

Not Confirmed to Fit

2019 Ram 3500

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roadmaster anti-sway bars bar fixed end link rear - 1-1/8 inch diameter

roadmaster anti-sway bars fixed end link no drilling required rm-1129-143

roadmaster anti-sway bars rear no drilling required rm-1129-143

roadmaster anti-sway bars rear fixed end link rm-1129-143

roadmaster anti-sway bars bar no drilling required

roadmaster anti-sway bars rear fixed end link

roadmaster anti-sway bars bar no drilling required rear - 1-1/8 inch diameter

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2015 ram promaster 3500 anti-sway bars roadmaster rear no drilling required rm-1129-143

2015 ram promaster 3500 anti-sway bars roadmaster bar no drilling required on a vehicle

2015 ram promaster 3500 anti-sway bars roadmaster rear fixed end link on a vehicle

2015 ram promaster 3500 anti-sway bars roadmaster rear fixed end link rm-1129-143

2015 ram promaster 3500 anti-sway bars roadmaster bar fixed end link rear - 1-1/8 inch diameter

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Videos

A Closer Look at the Roadmaster Rear Anti-Sway Bar

Detailed Breakdown of the Roadmaster Rear Anti-Sway Bar-RM-1129-143

Roadmaster Rear Anti-Sway Bar Installation Guide - 2015 Ram ProMaster 3500

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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-1129-143 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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Roadmaster Anti-Sway Bars - RM-1129-143

Highlights

Custom Fit for Your Vehicle: Tuned to your suspension for better control and stability.
Reduces Sway: 1-1/8" chromoly steel bar cuts side-to-side roll for a steadier, more controlled ride.
Handles Crosswinds: Keeps your vehicle level against gusts, passing trucks, and shifting weight.
Less Driver Fatigue: Minimizes steering effort so long drives feel smoother and less tiring.
Improves Cornering: Balances weight transfer for confident turns and quick maneuvers.
Uses Existing Connections: Mounts to rear axle and chassis with included heavy-gauge hardware.

Features to know about

Better Highway Control: 1-1/8" Rear Bar Cuts Sway and Roll

Long stretches of highway and gusty crosswinds can make a rig feel like it’s fighting you the whole way. The 1-1/8" diameter Roadmaster Rear Anti-Sway Bar ties the axle to the frame to balance weight transfer and reduce side-to-side movement. You’ll feel the difference in how steady it tracks through turns and how little correction is needed when semis pass or winds pick up. The result is a level, predictable ride that takes the stress out of long drives.

Installed Roadmaster rear anti-sway bar mounted to vehicle rear axle, showing how the stabilizing bar connects to the chassis to reduce sway and improve handling.

Confidence in Every Turn: 4140 Chromoly Steel Strength

This bar isn’t just thick—it’s built from 4140 chromoly steel, a high-strength alloy that’s considerably tougher than the standard 1020 steel found in many stock setups. That extra stiffness means it resists torsional flex by nearly 30 percent more, keeping body roll under control when cornering, merging, or dodging potholes. You’ll notice how much more planted the chassis feels through quick maneuvers.

Smooth Ride Support: Durable Polyurethane Bushings

Instead of soft rubber, the system uses polyurethane bushings that don’t break down from oil, gasoline, or ozone. They hold their shape over time, keeping the connection firm between bar and frame. That consistency translates to sharper response and less lean, even after years of use.

Close-up of Roadmaster anti-sway bar polyurethane bushings and grommets showing their durable design and attachment points for improved suspension performance.

Straightforward Install: Bolt-On Hardware, No Drilling Needed

No need to drill into the frame or hunt for extra parts. The sway bar bolts up with the included heavy-gauge hardware and bushing lubricant. It’s designed to avoid interference with common suspension add-ons, so you can upgrade stability without reworking the rest of your setup.

Built for the Long Haul: Consistent, Balanced Stability

The Roadmaster system doesn’t just tame sway—it works with your existing suspension to keep everything balanced through changing loads or uneven pavement. Whether it’s crosswinds, passing traffic, or shifting cargo, the rear bar helps the frame hold its line so you can focus on the drive instead of constant steering correction.

Specs

Specifications

Bar diameter: 1-1/8"
Warranty: Limited Lifetime Warranty

1129-143 Road Master Anti-Sway Bar - Rear

Installation Details RM-1129-143 Installation instructions

This Product Fits The Following Vehicles

2014 - 2018 Ram ProMaster 1500
2014 - 2018 Ram ProMaster 2500
2014 - 2018 Ram ProMaster 3500

Customer Satisfaction Score:

95% were satisfied with this product

5% of customers were not satisfied

Wrong item was ordered

5% of customers were not satisfied

Wrong item was ordered

4.8

2530 reviews

5 Stars		(2163)
4 Stars		(253)
3 Stars		(48)
2 Stars		(22)
1 Star		(44)

by: Bettyjean 11/15/2025 One Year Later

Great product and was a great solution to the swaying if our loaded Promaster 2500 van
Great fit and an easy install!

Kate F.

11/19/2025

It really is amazing the difference an upgraded sway bar makes Bettyjean (I love your name)! What has been your favorite adventure this year... where did you go, what did you explore?

by: Taylor 07/28/2025

2018 Ram ProMaster 2500

Installed just fine on my 2018 Ram ProMaster 2500, and seems to work well so far. The included instructions were terrible, the black and white images were worthless, the labeling of the diagram compared to the parts list was illegible and did not match the written instructions, and the diagram did not show where the end links actually attach to the vehicle axle relative to all the washers. Luckily the video on the webpage here helps clear things up some. If you have a normal van, not an RV, and are doing this at home on the ground, then getting the bar situated at first is tricky. Face the tips of it towards the front of the van, route it over the exhaust and leaf spring on the driver side, then over the passenger leaf spring, then spin it so the ends point rearwards. The link bolts don't line up quite square, but I guess thats what the large bushings are for. Overall seems like a quality product.

by: Adrian R. 02/09/2025

2018 Ram ProMaster 2500

This has been my worst purchase from etrailer by far. I have a Ram 2500 promaster and while this says it should fit, there have been nothing but problems since I started to try to install it. First, the instructions are literally unusable. No photos, no details of where to look for things, only thing they provide is a decent material list. I had to go to forums to try to find other sway bar installation photos just to figure out where each piece should be installed. Second, the washers and bolts to install the bushing clamps are too big and came in mismatched sizes. I had to go out and buy 3 new bolts just to get a matching set. Third, when the bushing clamps are installed with the bushings, the bolt holes do not line up and you can’t install the clamps on the van. There is literally no wiggle room to get the bolts in unless maybe if you put a clamp on the pushing to warp it to the right size. As such, you can only fit one bolt for each clamp (obviously not usable in this condition). There needs to be more give for mortals to install that don’t have pneumatic power tools. This is definitely not a DIY project and I’m not even sure if it is possible to do in a garage. Overall really bad design. I will be trying to return it.

by: Paul 06/08/2023

2022 Ram ProMaster 2500

I recently ordered a Roadmaster rear anti-sway bar for my 2022 Ram Promaster 2500. As I have come to expect, the order arrived very quickly in three days and in excellent condition.

Unfortunately, this Roadmaster bar does not fit the 2022 Ram Promaster 2500. I don't believe this is Etrailer's fault, however, as Roadmaster's own website claims their item #RM-1129-143 does in fact fit this vehicle. It clearly does not. In fact, a competing product from Hellwig fits 2500 Promasters up to 2021, but NOT 2022. So, I conclude the Roadmaster product is incorrectly specified by the manufacturer for the 2022 Promaster 2500.

I have given this review 5 stars because Etrailer immediately issued a UPS prepaid return sticker and refunded my purchase upon receipt of the package. They are terrific about resolving issues such as this.

by: Walt 05/20/2022

I called in to ask some questions about a sway bar and reached Paul B. He was precise and professional in describing the answers to all my questions. He confirmed that the item I inquired about was in stock. I ordered the sway bar and Paul confirmed it would be shipped that day.
I received in just a couple days. Thanks E-Trailer!

by: Josh 12/31/2024 One Year Later

Ram ProMaster 2500

Worked great for my promaster van.

by: William 12/15/2021

installed very well, the drawing was the most help.Had one rubber mount bolt with smaller head size. Added 1 hour to installation time.

by: Carri 03/17/2022

Thanks so much for getting this to me asap!!! You guys really came thru for me. No one else had this in stock or could ship quickly.

Carri One Year Later

3/18/2023

Fantastic, drive is so much better especially when it’s windy or raining

by: Bob 11/22/2023

Needs a better instruction sheet, needs better images.
a video would be helpful.

by: David 07/11/2022 One Year Later

by: Bob 09/21/2022

by: Hreg 07/15/2022

by: Clinton 06/09/2023

by: Matthew 10/06/2025

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.

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Matthew One Year Later

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.

10/7/2026

@Matthew great to hear! I am glad it's working well for you!

by: Fred 08/14/2025

Excellent high quality product made a big difference in handling with heavy Artic Fox camper
Give poor rating regarding installation instructions

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Fred One Year Later

8/15/2026

Excellent it works great

Jerred H.

8/16/2026

@Fred That's great to hear Fred! Thanks for coming back and sharing that feedback!

by: Kris 03/16/2025

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.

Click to Enlarge

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 One Year Later

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: Steven 09/23/2025

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.

Click to Enlarge

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: Veety 10/01/2026

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: Ken 08/10/2024

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.

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Ken One Year Later

8/19/2025

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

by: Maya 08/21/2026 One Year Later

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: Thomas 11/01/2025

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.

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by: Leonard 06/21/2024

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.

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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 One Year Later

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: William 10/09/2026

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: John 09/01/2026

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: Dan kb7uxe 04/21/2025

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. One Year Later

4/22/2026

wondaful! highly recommended.

2530

true

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Do you have a question about this Anti-Sway Bar?

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Best improvement we can help you with is a rear sway bar upgrade for your 2015 Ram Promaster RV with the Roadmaster sway bar # RM-1129-143. This will do the best job and improving the issues you mentioned. Since Ram built your vehicle without it having an RV body installed on it the rear sway bar just isn't adequate to provide you with a stable and smooth ride quality. That's why the Roadmaster bar will help a great deal as they designed this bar to fit your vehicle and be setup for and...
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