I have a relatively short Class C, at 23+ feet. It is about 11 ft 6 inch high to the top of the rubber duckie antenna, so I made a nice placard and put 12ft 0 inches for a minimum safe height for canopies and bridges. I have been driving it locally trying to burn the fuel out of the tank so I can drop the tank to fix a leak. rural state highways and in town traffic, been a good experience for me, about 450 miles so far, darn thing gets nearly 20 mpg when you hold the speed to 55 and below.
Just get in it and drive. Burn up a couple of tanks of fuel getting used to it, and how it SOUNDS and FEELS, watching temperatures (engine AND transmission) and other essential things.
Charles