There are (currently) three major areas of expertise covered on this site:
- Auto (vehicle) mechanics
- Auto Body Work
- Performance Engineering
The criteria I would use for all these questions is "Would I bring my [RV, ATV, trailer, boat, jetski, snowmobile, golf cart] to one of these experts to resolve my problem?" If the answer is "yes", it should be on topic:
- Batteries/Alternators
- Body Work
- Fuel Systems
- Engines, Drivetrain, Brakes, Maintenance, etc.
For the more home-y aspects of running and operating a motorhome, I'm not sure you will find the expertise you need here. Questions about furnaces, kitchens, plumbing, furnishing, trim, and the like are probably better asked on the Home ImprovementHome Improvement Stack Exchange.