A couple of years ago while dry camping in the Rockies, my grand daughter dog kept nosing around the 5er and whining. After we left there and went to a campground, I noticed some droppings in the basement and paper towel that was chewed up. I went out and bought 2 mouse traps and loaded them up with peanut butter. I caught 2 mice a day for 5 days. They really must have enjoyed the ride form the Rockies to Edmonton, Alberta. Anyway I sealed up every hole that I could find. This year we spent 3 weeks dry camping in the Rockies and not one mouse....that I know of. My wife leaves bounce sheets all over the inside of the 5er when it's not in use.