It seems that the Fords are a hit or miss on the handling problems,but it has been a well known problem.On the other hand the Chevy based Class C is not known to have these problems and it has a much
Larger cockpit area.
On the small RV you are looking at the small difference in the weight specs should be just fine on the Chevy Chassis.
I would say when given the chance to drive them,do that and then make your choice. The thread in my signature may give you some answers on the Chevy Based Class C.
On Edit Is there a price difference between the Ford and Chevy?