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Minimize sway and driver fatigue by improving the stability and driveability of your Freightliner Sprinter. 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.
Features:
Specs:
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.
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.
Customer Satisfaction Score:
85% were satisfied with this product
15% of customers were not satisfied
Ratings & Reviews
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.
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.
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.
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.
Excellent high quality product made a big difference in handling with heavy Artic Fox camper
Give poor rating regarding installation instructions
GREAT JOB AGAIN.
Very significant improvement for the ride of the van for better
Excellent quality and a definite improvement in handling of my 2017 Mercedes Benz Sprinter 170” van. Would definitely recommend this .
looks great. arrived in perfect condition. will install this weekend.
The customer service are very professional and pads the right recommendations on the product
The anti sway bar was a big improvement to the handling of my Winnebago View.
It especially is helpful in very windy conditions.
etrailer customer service is fantastic. They helped me decide on the product that best fit my needs and promptly got the order filled and delivered. This type of personal service is not found very often anymore. It is greatly appreciated though. I would not hesitate to use them again for my trailering needs.
Great product and service. I ordered incorrectly initially (should have called etrailer before ordering) and they made things right and quickly. Best company for quality and service!
Bolt on simple install has greatly improved the side to side sway. It’s not perfect and I think the next thing is to replace the factory shocks. I believe adding better shocks will add to the swaybar
As usual, etrailer shipped the Roadmaster anti-sway bar quickly. It arrived in two days and I installed it today on our Jayco Melbourne motor home. The motorhome is built on a Mercedes 3500 chassis. Installation was straight forward but it did help to have an impact wrench with 18mm socket.
I’m on my 3rd Sprinter based RV and if I’m going to be honest, I noticed a much bigger difference in sway control on my last RV that I installed a Hellwig on. The Roadmaster was cheaper and seemed at least as sturdy but I just didn’t think it provided as much improvement as the Hellwig.
Delivery was prompt. Product was as advertised. Installation was straightforward, despite my aging bones and wimpy arms, and the instructions were adequate to the task. On the road, there was a noticeable improvement in side-to-side motion; not dramatic, but noticeable. This is what I expected and desired. Had I been looking for dramatic, I would have opted for the add-on bar, rather than the replacement. This one did not require drilling the frame, and besides, sometimes dramatic improvements in one aspect of the suspension come at the cost of detriment in other areas. This bar improved the overall handling, especially at low speed, without any detriment to that lovely Mercedes ride that I love so well. The exaggerated side-to-side movements that used to empty the counters every time I turned out of a driveway are gone. I recommend this bar without reservation.
Of all the components I put on (Shocks, Swaybars, SuperSprings) this made the most difference. Easy install No Drilling. 2011 Mercedes Sprinter 3500
You folks were fast to process the return. Excellent customer service. I will be using you services going forward.
Victoria H.
2/15/2025
I'm happy to hear we were able to turn this experience around for you, Malcolm. We will be here and ready to help whenever you need!
Two parts to this:
1. The sway bar comes with very nice polyurethane bushings and works good. Reduced the side-to-side sway on my class C RV quite a bit. A very high quality product. Fit is perfect. The only criticism I can make is that there was no guidance on torque settings. I got the attachment bolts as tight as I could with a 1/2 socket bar (about 18" long) Mercedes Dealership said they were not near tight enough.
2. The vendor, etrailer, service was outstanding. I had a trip coming up and needed this bar asap, and that's how they sent it... asap. As I recall I got it in a couple days. Thanks to them. They've helped me with getting other parts quickly, too.
Roger G.
5/10/2020
Working just fine. In retrospect though, I maybe should have ed the heavier model, but that requires chassis mods that would have made the install more difficult. All-in-all it worked great on our trip from WA state up through BC and Yukon Territory to Anchorage, AK. No problems, no worries.
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.
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George M.
8/17/2023
Easy install and what a difference it makes. dont know why this is not stock on these vans.