I do feel on a fundamental level the sway bars installed in E350/450 are not perfectly specified for a class C motorhome. The chassis is sold as a jack of all trades. I think that heavier sway bars offer an improvement in handling. I think the factory shocks are not spot on either.
I knew on test ride the handling was not to my liking. The issues were not warranty issues and I did not feel there was any free avenue to correct them. It was a typically short test drive. There were compelling other factors leading me to my choice of motorhome-appropriate size, floorplan, ease of maintenance, durability, build quality, local factory and service.
All RVs are a compromise. For the most part I think mine is fantastic. The handling isn't it's prettiest feature. What's perfect? Whats the big deal about dialing in an otherwise very nice RV?