My insurance company was VERY specific about not renting, or using the RV for "any business purpose"; or my coverage would immediately be dropped.
Bottom line - nobody takes care of your "stuff" like YOU do. I loaned a pop-up camper to my mom and sister to stay in for the 4-H Fair. I delivered it and set it up for them, eliminating any problems with that. When I went to pick it up - it wasn't damaged, just dirty. I mean FILTHY from dust/mud/hay etc. Took me all day to get it clean again. It was the perfect example for me, of why I would say "no" to anyone else who wanted to borrow any of our RVs.