Ford E-350 & E-450
The Class "C" Ford has not changed much since the mid nineties. The main difference is the E 350 may or may not have a rear sway bar and the E 450 has a factory rear sway bar.
On the E 350 we replace the front bar with a larger bar and add or replace the rear sway bar with a larger bar.
On the E 450 we replace the front and rear sway bars with larger sway bars.
These changes improve the stability of the coach. Sway Bars on the Class "C" help with rocking and also with steering as it helps to minimize bump steer.