Will a 24' Class B+ on an E450 Chassis be too rough

John & Angela wrote:
The difference between the E350 and the E450 is the E450 comes stock with a rear sway bar.

This is true only for the 2007 E350 and older. The 2008 and newer get one straight from Ford, though not heavy duty like an aftermarket bar. Some people change out the Ford stock bars for thicker more effective ones. I suppose it's a "Wait-N-See" scenerio whether you need one or not on the 2008 or newer chassis. Maybe a 24 footer won't, but a 31 footer will.