Mice in campers is an on going problem all over. Those little folks want to get in out of the weather and a camper is one of the best places.
A 5th wheel does not have as much wiring as a Motor Home so thats a plus. It sounds like this camper is what you are looking for, I would ask the seller about it. The answer will most likely be they knew nothing about it. You might what to ask seller if they would either pay or take money off for a pest control company come and take care of the problem.
Mice can get into the smallest places, when winterizing mouse precaution is part of the plan. I use alot of mouth balls, make sure all of the entirety points are blocked off. I also have the sonic pest things plugged into my outlets.
