Be sure that you can tolerate sleeping in the overhead bed and/or convertible couch/dinette. Most older folks are not agile enough to climb over their partner in the dark and down a ladder to go to the bathroom and then back to bed without waking them. There is little storage room in a short class C and you wind up with boxes and bags where they get in your way. Dogs will want to sleep where you want to sit or you will be stepping over them. Sit in some short Class C's and simulate everyday and night activity including TV watching.
Maybe you can spend most of your camping time outdoors so you avoid "cabin fever".