I have owned 2 super C's. First was a 38 ft single rear axle on a M2 chassis. It had lots of overhang in the rear. I had issues going up any rapid changing ramp, parking lot or road with a significant rapid change in angle. The manufacture added dollies at the rear to protect it from rubbing. Another low spot was the stairs, halfway between the axles, I rubbed those on a couple of parking lot aprons.
Our current is based on a class 8 truck. No problem in the rear but the span between the steers and the front drives is long and I can imagine with the right crown it could rub. I have never had this problem and would avoid any roads, parking lots or ramps that look questionable.
If your drive is steep, you might have to limit your rv choices to shorter wheel base versions without long rear overhangs.
2007 Haulmark 3301ds
2012 Jeep Sahara