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Roadmaster Rear Anti-Sway Bar - 2" Diameter
(2527 reviews)
Price: $1,055.00
In Stock
Roadmaster
Roadmaster Rear Anti-Sway Bar - 2" Diameter
Part Number: RM99MR
In Stock
$1,055.00
Retail:$1,173.59
You Save: $118.59
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- Reviews (2527)
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- Videos (1)
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Roadmaster Anti-Sway Bars - RM99MR
Highlights
- Custom Fit for Your Vehicle: Tuned to your suspension for better control and stability.
- Reduces Sway: 2" 4140 chromoly steel bar controls side-to-side motion for a steadier ride.
- Handles Crosswinds: Keeps your vehicle level through gusts, passing traffic, and shifting loads.
- Less Driver Fatigue: Cuts constant steering corrections so long trips feel smoother and more comfortable.
- Improves Cornering: Balances weight transfer and body roll for confident turns and quick maneuvers.
- Uses Existing Connections: Mounts to rear axle and frame with included hardware, no drilling required.
Features to know about
Stronger Handling and Control: 2" 4140 Chromoly Steel Bar
Body roll can make any rig feel unstable in turns or during sudden lane changes. This rear anti-sway bar ties the frame to the rear axle with a thick 2" 4140 chromoly steel bar that’s built for serious torsional stiffness. That extra diameter and stronger alloy mean it resists twist better than standard steel, keeping the vehicle flatter and more controlled through corners and quick maneuvers.
Confidence in Crosswinds: Rear Bar Balances Weight Transfer
Crosswinds and passing traffic don’t have to knock you off your line. This setup connects the rear axle and chassis to balance weight transfer as the vehicle shifts, cutting out side-to-side sway. The result is steadier tracking on the highway and far less steering correction when conditions get unpredictable.
Less Fatigue on Long Drives: Stable, Predictable Ride
A steady, level ride takes the stress out of long hauls. By minimizing body roll and sway, this bar keeps the rig planted even on uneven pavement or gusty roads. The steering stays consistent, the body stays level, and you finish the drive without feeling worn out.
Built to Last: Polyurethane Bushings and Premium Finish
Instead of soft rubber, the bar uses polyurethane bushings that shrug off oil, gasoline, and ozone. They stay tight and supportive over time without squishing out or cracking. The complete setup includes Loctite and all the mounting hardware, so it goes on cleanly with no drilling required and stays solid mile after mile.
Specs
Dimensions
- Bar diameter: 2"
Warranty
- Limited lifetime warranty
1249-102 Road Master Anti-Sway Bar - Rear
This Product Fits The Following Vehicles
- 2018 - 2022 Tiffin Powerglide
Video of Roadmaster Rear Anti-Sway Bar - 2" Diameter
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Video Transcript for All About the Roadmaster Rear Anti-Sway Bar-RM99MR
Hi, everybody. Andy here with etrailer.com, and today we're gonna take a look at this Roadmaster Rear Anti-Sway Bar. This bar is going to mount to the rear axle into the frame of your vehicle to help minimize side-to-side movement, improving the overall stability of your vehicle. This bar will let you execute turns and quick maneuvers with confidence, giving you a level ride even on irregular surfaces, and it's going to help reduce driver fatigue by minimizing the effort required to keep your vehicle in line. It's also going to help diminish the effects of crosswinds, passing motorists, and shifting cargo. This anti-sway bar does for side-to-side movement what a good pair of shocks does for up and down motion, giving you a marked improvement in your vehicle's stability.
Now this is designed to fit the 2018 and newer Tiffin PowerGlide, and this is going to work in conjunction with your Tiffin PowerGlide suspension system. This 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. It has been engineered to avoid interference with most popular aftermarket add-ons and accessories. The diameter of the bar itself is two inches, and this is made here in the USA of 4140 chromoly steel for superior strength. By the way, this type of steel is considerably harder and stronger than your standard 1020 steel that is typically used in anti-sway applications.
In addition, the larger diameter of the bar is going to increase the torsional roll stiffness. So this includes everything that you see here on the table before me. You're going to get your anti-sway bar. You're going to get a small vial of Loctite to apply to the factory nuts and bolts during the installation. And speaking of installation, you are going to get a set of really good instructions to walk you through the installation process.
This does have a limited lifetime warranty, and I just wanted to mention that this bar is pretty heavy. It's very heavy for me, and I'm not necessarily a strong guy but I did need help to get this on the table. So keep that in mind. During installation, you might want some help to help you mount this and maybe hold onto it while you are installing this. Well, that's gonna conclude our look today.
I do hope that it was helpful for you. Again, my name is Andy. Thank you for joining me.
Ratings & Reviews
4.8
2527 reviews
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.
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.
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
Give poor rating regarding installation instructions
Fred
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.
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.
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
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.
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.
Ken
8/19/2025
No complaints with the handling. This is a good sway bar!
by:
Maya
08/21/2026
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.
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.
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.
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
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:
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.
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.
4/22/2026
wondaful! highly recommended.
by:
Rob
08/26/2026
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.
The install was fairly straight forward.
Haven't had a chance to tow the 5th-wheel yet.
by:
Gene
10/12/2026
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:
Curtis
04/26/2025
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.
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:
Franz B
10/05/2026
dodge
Ram Pickup
I Installed the bar in my Ram promaster HR 2500 and it’s an incredible difference on twisty mountain roads. I highly recommend it.
by:
Timothy
10/14/2026
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
Roadmaster Rear Anti-Sway Bar - 1-5/8" Diameter the sway bar itself
by:
Dimitrios
06/11/2025
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.
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.
6/17/2025
So glad to hear that, Dimitrios! Thanks for including a photo, too.
by:
David
09/22/2026
2026
Ford
Transit Connect
Super quality product build. However it is made for ford transit dually. I have single rear tires. Worked with road master rep to select the correct sway bar for my van.. RM82EQ
by:
Bruce
07/20/2026
Easy installation ,done by myself laying on my back in the driveway only took about 1 1/2 hours to do. I have a lift but didn't use it and I think it was easier on the ground for just one person. Sway bar made a big difference in the drivability of my 2003 E350 pleasure way class B
I'll upgrade the front factory bar to the HD Roadmaster bar soon
If you have issues with the handling of your Ford pleasure way start with this sway bar
I'll upgrade the front factory bar to the HD Roadmaster bar soon
If you have issues with the handling of your Ford pleasure way start with this sway bar
by:
Michael
03/21/2025
After a year of usage, I couldn't be happier with the Roadmaster front and rear anti-sway bar kits. The rear kit for my W22 chassy, the mounting hardward would not fit properly. I call Roadmaster directly and they custom built the mounts, painted, and shipped within days.
Michael
3/25/2026
After a year the system is working great. It has made the driving much safer and smoother.
Gwendolyn Y.
3/25/2026
@Michael Love hearing about your yearly updates, Michael. Where are you headed to next?
by:
Riley
03/05/2025
Ford
F-350 Super Duty
I love this sway bar, and love the service and overall experience with etrailer. My F350 came with factory sway bars front and rear, and I'd replaced the rear bar several years ago, and was impressed with the difference it made. So, more recently I ordered the front bar to replace the smaller factory unit, and it again made a wonderful change for the better. Our Bigfoot truck camper is tall and heavy, but our rig handles wonderfully and has essentially no sway or rock in traffic or on bumpy roads. I highly recommend this sway bar.
Gwendolyn Y.
3/7/2025
Sounds like a much smoother drive, Riley! I looked up your camper to see how tall it is and I can see exactly why its called a Bigfoot. What's been your favorite place you've traveled to so far with the camper?
Riley
3/6/2026
The two Roadmastercsway bars weve been using continue to impress and perform like they did on day one. Driving back across the country with some days having stiff criswinds continually we rode comfortably and never had handling or steering issues. I remain adamant that these are undoubtedly the best products on the market for this application and welcome any questions. For reference my truck is a 2018 F350 crew cab DRW, 6.7 diesel 4x4 long bed with Bigfoot 3000 series truck camper. Get the Roadmasters!
by:
Thomas
09/09/2026
I have a hard side slide in camper in the back of my pickup. This is the first time I installed an Anti-Sway Bar of any kind. It took me about 6 hours to install. But it works, and it works really well. I'm glad I took the time to install it.
by:
Robert
07/13/2026
2017
Chevrolet
Express Van
Easy to install by myself in the driveway. I replaced both the front and rear anti-sway bars and the improved handling characteristics were noticeable immediately. Fantastic product!
by:
Kevin Bounder(33c
06/17/2025
2018
Ford
F-53
Installation was 6/10 in difficulty only because of obstacles in the way of the top bolt on the passenger side end link. This was a step up to a 1 3/4" bar from the factory 1 1/2" bar. The end links were much beefier than the factory ones.
Initial test drive - I was impressed that the front roll on curvy roads was greatly decreased. This has been a significant improvement to driveability.
Initial test drive - I was impressed that the front roll on curvy roads was greatly decreased. This has been a significant improvement to driveability.
Brooke M.
6/18/2025
Super happy to hear that, Kevin! Thanks for including the photos, too. Would you have any tips or tricks for any future readers about how to get around the obstacle you mentioned?
Brooke M.
6/22/2025
@KevinB That is sound advice, for sure, Kevin! Sorry to hear about the delay but I appreciate you talking about what would have saved you some time and hopefully your tips here will help someone else out, too :)
by:
Ronald
06/23/2026
As others have said the sway bar is good but the directions could be improved. Removing the old down link on the drivers side is a bit of a challenge as you can't easily remove the old bracket until you remove the downlink. Unfortunately you can't get the bolt holding the link to the bracket without supporting the fuel tank and removing the rear strap so that you can push the tank over far enough to get the bolt out. Another issue was the old U brackets holding up the old sway bar were on 3" centers where the new bracket is on 2 3/4" centers. This looks like an insurmountable problem until you remove the star washers holding the old bolts where you can see there is a slot which allows you to use the bolts included. The old bolts were both attached to a plate which kept made the center distance between the bolts non adjustable so using the old bolts is not an option. On the passenger side the plate holding the 2 bolts was connected to the axle connection for the height sensing proportioning valve. I removed the 3 bolts holding it, took out the plate and cut off the front most bolt and reinstalled the plate. Fortunately that allowed me to use the old bolt in the plate and for the front most bolt I used one from the kit and achieved the 2 3/4" center spacing needed for the new bracket. All of this would be nice to know when you tackle this job. Fortunately I had all the tools needed to complete the job. I found it easy to install the new bar despite its weight by lifting up one end of the sway bar and loosely attaching it to the the down link. I then did the other side and once both ends were attached I put the center of the bar on my hydraulic jack and lifted it into place. This made it a fairly easy job to position and attach the U brackets to the axle despite the heavy weight of the bar. A video of this process on an older (1998 vintage) Dodge Ram 2500 would be a big help.
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See what our Experts say about this Roadmaster Anti-Sway Bars
- Recommended Anti-Sway Bars For A 2020 Tiffin Allegro Bus 40IP Class A MotorhomeHi Douglas, There are both front and rear anti-sway bars available for your 2020 Tiffin Allegro Bus 40IP on Tiffin's Powerglide chassis from Roadmaster. For The front you'll need part # RM97GR and for the rear part # RM99MR. If you're wanting to add in a steering stabilizer as well then you'll need the Roadmaster Exact Center Steering Stabilizer # RM73RR and part # RM49MR for the mounting brackets and
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Info for this part was:
Edited by:
Lindsey S
Updated by:
Wilson B
Installed by:
Andy C
Written by:
Sabrina W
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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!