We just went from TT to class C. Walk through was the same. Systems are very similar. I like ATVer's advice.
If something isn't quite right, make sure they fix it right away so you don't have to go back to the dealer a week later.
Make sure you spend some time driving the unit, especially learning an setting up the back up camera if you have one. And get info on towing a toad if you plan to get one.
Owners of a 2013 Sunseeker 3170 Class C beauty. We travel with two shih tzu, a leonberger and, oh, yeah, two teens and a 6-year-old.