I didn't know mice were a problem with campers/RVs. We've owned several (campers, not mice) in the past ten years and haven't ever seen a mouse in them. The house now, since the demise of our last kitty - ever smelt a mouse that's chewed its way through the cork of a quarter-full wine bottle, apparently drank itself to death and lay sodden in the bottom for a few days in the cupboard? It took drastic measures to get rid of the odor, and I still think I catch a whiff of it now and then... or that's its tiny drunken ghost.