Sway Bar Options To Reduce Sway And Body Roll On 2016 Thor FourWinds 35SK RV F550 Chassis

Updated 05/29/2026 | Published 05/22/2026

Products Featured in This Question

Roadmaster Front Anti-Sway Bar - 1-3/4" Diameter

(2435)

$900.00

Hellwig Front Anti-Sway Bar - 1-1/2" Diameter

(313)

$359.46

Hellwig Rear Anti-Sway Bar - 1-1/2" Diameter

(313)

$411.94

Roadmaster Rear Anti-Sway Bar - 1-3/4" Diameter

(2435)

$1650.00

SumoSprings Solo Custom Helper Springs - Rear Axle

(2402)

$507.99

Question:

I have a 2016 Thor Four Winds 35SK on a 2015 F550 chassis rear wheel drive. I have a lot of sway in the front, and maybe a little in the back. Ford looked at the suspension and everything is fine, but they recommended new sway bars for the front and the back, that would be beefier and remove the sway. They stated that e trailer would have what I am looking for. What would you recommend on this Diesel Super C?

asked by: Scott B

Expert Reply:

Hey Scott, they are correct. Upgrading the front and rear sway bars will certainly help keep your Thor Four Winds Class C RV straight on the road while reducing sway. You will notice a lot less body roll on turns too!

For the best of the best, I'd go with Roadmaster Rear Anti-Sway Bar - 1-3/4" Diameter # RM23ZR and Roadmaster Front Anti-Sway Bar - 1-3/4" Diameter # RM33BQ. While they are a little pricey, they are the beefiest and biggest options for your setup.

For a second best setup that is a lot easier on the wallet, the Hellwig Front Anti-Sway Bar - 1-1/2" Diameter # HE34MR and Hellwig Rear Anti-Sway Bar - 1-1/2" Diameter # HE83RR are excellent options. They are slightly smaller diameter than the other options, but are still bigger than OEM sway bars and will help a lot. I have the Hellwig bars on my truck and it reduced body roll on turns while towing immensely.

If you wanted to go all out and help reduce sag on the back end (if that's an issue for you), then you can also add some suspension enhancement like SumoSprings Solo Custom Helper Springs - Rear Axle # SSR-118-54. I also have the SumoSprings on the rear of my truck and it doesn't squat anymore when towing.

Let me know what you think! Where do you normally take the RV?

expert reply by: Andrew N

Scott B.

5/26/2026

I just got it, but the plan is to go out to the southwest. Being in the Chicago area, I’m not used to the mountains and curves. I've also started looking at the Weldtec with the Koni shocks. These are pricey. I've got a lot to think about... Thank you

Andrew N.

5/26/2026

@ScottB Cool! You're not terribly far from us in Wentzville Missouri then. Yes the mountains are terrible for RVs; most people don't realize it until they try it. And I know all of the options can add up to quite a bit of money, so let me know if you need any other help and take you're time since there's a lot to consider! Even if your decision leads you to another company, I'm still happy to help with questions :)

David J.

5/29/2026

@ScottB. I agree with most everything you are doing. I started with sumo springs front and rear and front shocks. And that was an improvement. I drove it like that for awhile but I was wearing tires the inside edge of the inside rear tires were gone. My tire guy recommended I go up a size to a 245 70R 19.5 more rubber on the road and each tire was rated to carry 550 lbs more. Ford rated my rig to carry 19500 lbs max I’ve weighed it 3 times know and I’m always between 19500 and 20,000 lbs. I hooked up with a truck repair company they recommended upgrading springs they said I shouldn’t be riding all the time on the sumo springs. They added 2 leafs to the back and heavier coil springs up front. Raised the rear 2 inches and the front 1 3/4 inches know the sumo springs made a real nice bump stop. The I put on the road master 1 3/4 inch rear sway bar from Etrailer. Then we loaded up and drove from Mich to Arizona and back. It road and handle so much better huge improvement. But now with more bounce in the rear springs I put on Koni rear shocks and I added the front 1 3/4 roadmaster anti sway bar and I m waiting for the roadmaster steering stabilizer to come in in a couple weeks. I’m very happy with all the improvements I’ve done. I think you’re on the right track. The only thing I find hard to believe is that your stock springs are doing the job. I’m guessing you are max out weight wise. The sweet spot for a comfortable ride on a stock spring is not driving on them maxed out all the time. The cost was hard to swallow but I’m glad I did it. Tires and a good alignment make sure the front end is tight. I hope that helps Good Luck to Safe travels