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If you’ve ever felt that uneasy lean through corners or quick maneuvers, this front bar takes that out of the equation. The 1-1/2" diameter 4140 chromoly steel gives it the torsional stiffness to balance weight transfer and hold the chassis steady. By tying the front axle to the frame, it minimizes side-to-side motion so the ride stays level and predictable. That means less body roll, better control, and a more planted feel every time you turn the wheel.
Crosswinds and passing semis can make long drives exhausting. This bar works to keep your line straight by bracing the chassis against the weight shift that happens when wind or heavy loads push from the side. You’ll spend less effort correcting and more time just cruising comfortably. It’s engineered to work with the vehicle’s suspension system to keep things balanced and smooth on rough roads or in gusty conditions.
This isn’t mild steel or soft rubber. The bar is built from thick 4140 chromoly, a chromium-molybdenum alloy that’s stronger and harder than typical 1020 steel. That extra strength means it’s better at resisting twist and nearly 30 percent more effective at controlling sway. The polyurethane bushings are tough, oil- and ozone-resistant, and don’t squish out like rubber, so they hold their shape and support for the long haul.
Installing this bar doesn’t call for frame drilling or special fabrication. It bolts directly to the front axle and chassis using the included heavy-gauge mounting hardware. With easy-to-follow instructions and supplied bushing lubricant, it’s a clean, straightforward upgrade that fits around most aftermarket equipment and gets you back on the road quickly.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
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.
Have not had time to install but looks to be very good quality
Excellent product which greatly improved control while loaded with the pickup camper and made right here in the great northwest! I was able to support two American small businesses in the same purchase!
Great customer service and fast shipping. Love the order tracking process.
What a difference! I haul a heavy truck camper and this made a world of difference when cornering. Very happy with the quality and performance of this product. As always, etrailer shipped the item quickly!
EXCELLENT CHOICE
The front anti-sway bar made a huge difference with a truck camper. I already had a rear and this helped even more. It stopped the sway from cross winds and trucks passing me. Had to make an evasive manuver when a truck pull out in front of me, it really made a difference.
I purchased this sway bar for my F350 to replace factory bar to reduce sway while hauling my very heavy (~5000 lb) truck camper. The bar fit perfectly, was easy to install, and has performed beautifully. Shortly after installation, I took the truck/camper on an 8000+ mile cross country trip and this sway bar performed great! Excellect product; much better than factory sway bar.
Keeps front end planted, helps handling and prevents sway with truck camper
Easy ordering process, fast shipping, easy install, quality product. Controls excessive body roll, but not intrusive.
Lorne
3/15/2025
Lets start by stating the I have a F350 Tremor, which is designed to flex. During normal driving it helps with body roll if I get spicy in the curves and when towing it helps minimize the push from when a truck passes on the highway. Otherwise, a great product and its pretty much forgotten that its there doing its work.
Robin H.
3/15/2025
Used it on my 2017 F350 even though RM didn't include it in their listing. It bolted on easily, and I can detect no clearance issues steering lock to lock. Nice improvement over the OEM with the camper loaded, and thicker than the Helwig.
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!
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Edward
3/12/2023
Great! Have been very satisfied.