We have had many campers and a few boats. Then only thing I can say about winterizing and mice protection is clean clean and clean again. Ensure there is NO food anywhere, including sunflower shells. I also find storing in places like barns is trouble looking to happen as these types of places are a haven for rodents. We have used Bounce sheets as well not knowing if they work or not (and like to keep it that way cause the only way to know is if they don't work), at worst it will keep your rig smelling good when you take it out of storage.