A Class C puts a tall, heavy box on a cutaway van chassis, often with a long rear overhang. That's why so many Class C owners report rocking side to side on uneven roads, sway when trucks pass, and a rear end that bottoms out. These are the upgrades that help most.
1. Shocks made for a motorhome
Swap tired factory shocks for heavy-duty B6 motorhome shocks. On the Ford E-Series, choose RV Comfort for ride or HD for heavy coaches; on the Express/Savana, match the part to your GVWR. See best shocks for Class C motorhomes for how to choose and Bilstein shocks for Class A and Class C motorhomes for part numbers.
2. Rear sway bar
For side-to-side rocking on a Class C, a larger or added rear sway bar is often the single most effective fix. Pair it with good shocks for the best result.
3. Helper springs or air bags
If the rear sags or bottoms out, add helper springs or air bags. Shocks control movement, but they don't carry weight.
4. Steering stabilizer and front-end check
Wandering on the highway usually comes from steering wear or alignment. Fix those first, then consider a steering stabilizer. See our motorhome steering stabilizer guide.
5. Tires and weight
Weigh the coach loaded, and set tire pressures from the load tables. On dual-rear-wheel Class C chassis, check both inner and outer rear tires. Inner duals are often run low without anyone noticing.
FAQ
How do I stop my Class C from swaying?
Fit motorhome shocks and a heavier rear sway bar, then check tire pressures and the steering. Together these fix most Class C sway.