We specifically went looking for a Class C that has good ground clearance at the back end. The hobby will sometimes take us to places that the clearance will be most welcome. The 2016 Thor 28Z Chateau is what we bought.
On our test drive, we tried to find places where we'd drag the back end and couldn't. The salesman was kinda having a fit and swore up and down that his own 2008 28 footer (don't know what make) would have scraped and hung up on most of the places we tried.
I'll let you know after our first full season whether our decision was on target. Very happy so far!
Jerry