To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
When weight shifts through a corner, a weak rear setup can make the whole vehicle lean and feel sloppy. This 1-1/2" diameter Roadmaster rear anti-sway bar ties the axle to the chassis to balance weight transfer and cut down body roll. You’ll feel the difference right away in corners and quick maneuvers — the ride stays level and controlled instead of rolling side to side.
Crosswinds and passing semis don’t have to throw you around. This rear anti-sway bar works to stabilize the chassis by bracing the frame against the axle, using the weight of the axle to steady the vehicle as it shifts in turns or gusts. The result is smoother tracking down the highway with less correction at the wheel.
Long highway days can be exhausting when you’re constantly fighting sway. By minimizing side-to-side motion, this setup makes it easier to hold your line through gusty stretches, uneven roads, or when loads shift. The steering stays predictable, the ride stays level, and you reach your destination without that worn-out feeling.
This isn’t standard mild steel. The bar is made of thick 4140 chromoly — a chromium-molybdenum alloy that’s tougher than 1020 steel and resists twist almost 30 percent better. Polyurethane bushings replace rubber ones for longer life and consistent support. They resist oil, gasoline, and ozone, so they don’t squish out or degrade with time.
Getting the benefits doesn’t mean complicated setup. The bar mounts to the rear axle and chassis using the included heavy-gauge hardware, with no need to drill into the frame. Instructions and bushing lubricant are included, so you can bolt it on and get back on the road with a more stable, confident ride.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hey there, heavy haulers. Today, we're going to take a look at the Roadmaster Rear Anti-sway Bar for Trucks. You can use our fit guide to find the right sway bar for your truck. This is what our sway bar looks like when it's installed. You can tell that it's significantly larger than our factory sway bar. This is what our old sway bar used to look like right here.
There's just really no comparison on how much thicker and stronger this sway bar is. This one here, I can't bend whatsoever. This guy, it was providing some support and I know I'm pushing it together, which really isn't how sway bars work. They work in a twisting motion, but this one is significantly smaller and is going to provide not nearly as much anti-sway as our stronger, larger bar here.The main purpose of upgrading to a larger sway bar like this is to help minimize sway. As you're going down the road and you make turns or evasive maneuvers, the body wants to roll.
As that rolls, it kind of throws you around in the cabin and makes it more difficult to maintain control of the vehicle. Also, when it sways, it shifts weight in a direction which could cause the vehicle to start to pull or slide in that direction. By minimizing the sway, it just helps stabilize the vehicle and provide you with more control and stability. Having a larger bar here is going to do just that for you.Also in this kit, you're going to receive new bushings, shackles, and hardware. So if you've got an old sway bar that's just got worn out bushings and you're looking to just repair it and you're wanting to upgrade it to have less sway, to be able to haul heavier items without feeling it throwing your truck around when you're going around those turns, this kit comes with all those components too.Let's go ahead and get a baseline measurement and we're going to hit the test course with our factory sway bar on there.
First, we're going to be in the bump section, which is going to simulate a pothole. The rear end does make quite a bit of noise and it doesn't feel that tight. There's a lot of back and forth rocking going on. Lastly, we're going to be going into our slalom section and this is going to simulate an evasive maneuver. On our slalom course, you can really feel how loose the truck is as we weave back and forth.
It's honestly a little scary to drive this, performing these big evasive maneuvers, so I can only imagine what it would be like if our truck bed was fully loaded.Now that we've got the new sway bar installed, I'm going to go ahead and take it out on the test course and we're going to see how it compared with our factory results. First, we're going to be in the bump section, and as we go over these bumps, we can definitely tell there is less rocking back and forth. It does seem to stiffen the vehicle up a little bit, so if you're concerned about having a smoother ride, this isn't really going to make it smoother, but this is really designed for those guys hauling heavy equipment so it's going to be more beneficial for them. Next we're going to be heading into our slalom section, and this is going to simulate an evasive maneuver. During this section, this is where I expect to see the biggest improvements as our sway bar is considerably larger than our old ones. So when we head up here, we're going to go ahead and start ripping her back and forth. Oh yeah, it definitely . wow, it really grips pretty good. It's actually pretty fun to drive. Considerable improvements over your factory components.In the end, upgrading your truck's rear anti-sway bar lets you execute turns and quick maneuvers with confidence, while reducing driver fatigue and minimizing the effort required to keep your vehicle in line due to crosswinds, passing motorists, and large shifting cargo. The 4140 chromiley 00:03:32 steel is going to be considerably harder and stronger than your factory installed sway bar. If you're concerned about up and down motion or your vehicle sagging down in the back, I suggest upgraded jounce bumpers or a set of airbags. That completes our look at the Roadmaster Rear Anti-sway Bar for Trucks.
Customer Satisfaction Score:
92% were satisfied with this product
8% of customers were not satisfied
Ratings & Reviews
I had a helwig system factory installed on my class C when i bought it in 2020. It was ok as i did not know any better. After 6 years of traveling there was a lot of sway and sagging. So i upgraded to this heavy duty Roadmaster system. What a major difference. the RV rides much more steady and smoothly, and i like it. I think the hellwig that was factory installed was the cheapest system they could find, so they could put the name on. I like Roadmaster equipment much better. Working with Roadmaster and E-trailer makes purchasing, installation and tech support much easier.
Excellent product, easy to install, definitely an upgrade from the oem. Removed the factory stabilizer and installed the roadmaster bar by myself in less than 2 hours. Installed on my 2023 Ram 2500HD.
I bought a motorhome (2014) that only had 24k miles on it. Driving it home two hours was a nightmare and I quickly realized why it only had 24k miles on it! Had this upgraded antisway bar put on it as well as an upgraded front bar and it made a huge difference. It allowed me to make a 2500 mile trip to visit with a sick relative for 10 days!
I submistted a review for both front and rear kits. Both etrailer and Roadmaster are great companies to purchase products. Roadmaster made custom parts and sent them within days.
What an unbelievable difference on my Fleetwood Class A Motorhome. Paired it with a new Rear anti sway bar and 4 new Koni EVO shocks. The handleing and steering are much improved and no more tail wagging in heavy winds, much more enjoyable to drive and no driver fatigue after long driving days.
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.
The product is great! All the other positive reviews of the product are accurate. However, the instructions were not for my vehicle and required a phone call for clarification. Waited about 10 mins on hold to talk to someone but this was on a Sunday so I was surprised that anyone answered. Good job on that. I purchased this item because the ad said no drilling. Step 3 in the instructions was to drill. I passed this on to the folks at etrailer and they agreed this was incorrect and offered a free return to correct the issue. As of 23 May 26 the ad has not been corrected so beware. I needed the item so it went from something I was going to install to something I needed to get installed. Finding an installer for an aftermarket part that requires drilling into your vehicle and wasn't sold by the installer was far more difficult than I thought it would be. Thankfully the guys at my local Air Force base auto hobby shop were up for the task and did a great job. Of course there is additional cost. 3 x $40 an hr for my time trying to install myself, reinstalling original gear, finding an installer and logistics of getting vehicle to and from shop. People dont generally value there time accurately. If you had to take time off work 1hr x $40 which I did should also be calculated. With the installer fees this amounted to an additional $380. That's additional cost to me because of a poorly advertised item. This is the part that bugs me about etrailer. They were very friendly on the phone and tried to be helpful with the instructions but other than returning the item, didn't offer a discount for the added frustration or even a coupon for a future purchase. This of course is not required of them but for a purchase as expensive as this you might think this would be a no brainer. I think they could do better.
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.
We were told this sway bar might not work on our Dodge Ram3500 dually. Let me tell you this worked great. Our truck has a camper on top and we took this on a long trip and it worked great. What a difference it made. This trip had lots of very high winds. We could easily tell the difference from before the sway bar and after. Thanks
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.
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!
1 of the best purchased I've made for my Fleetwood Discovery. All wandering is now gone. Took an afternoon to install (I'm a retired mechanic) and am very pleased with the outcome. I also purchased an Steering Stabilizer Shock a year before and I improved wandering maybe %25. Both purchases arrived (in Alaska) promptly and in good condition. I Will purchase from eTrailer.com again when needed.
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.
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.
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.
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
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.
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.
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 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.
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.
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.
Excellent high quality product made a big difference in handling with heavy Artic Fox camper
Give poor rating regarding installation instructions
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 customer service. etrailer carries great products and was able to get my order on time.
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