In the RV community there are large over laps between types. What is the difference between my 31' class A built on a F53 and a 31' TT being pulled by a gas powered F250 with a V10? Not very much. Probably the generator built into my coach. Do the comparison between a DP and a fifth wheel being pulled by a Dodge truck. Good chance both have the same engine. Slide out problems, well the fifth wheel builders started that idea maybe 20 years ago. Absorption fridge problems, pop ups have them and they work exactly the same. Black tank odors, well my poop doesn't stink so I can't help you with that one. Are roof leaks or delamination restricted to class A types only?
Sure there are some questions that one could say are very specific to a class A coach but there really isn't much.