Our camper shed is next to the pole barn. I keep our boat in the pole barn. Uncle Gus is a great mouse deterrent. Put about 6 throughout the camper. I keep the boat covered (do a lot of dust generating activities) and threw a couple Uncle Gus pouches in the boat for winter storage. Not sure how it works with larger rodents, but we never had an issue with them. We live in the woods and no rodent problem and the squirrel population has definitely grown this year. We used to have a bird feeder next to the barn which drew a lot of mice. When we moved that away from the barn, there was a marked reduction in mice. I keep a 5 gallon bucket mouse trap in the barn and rarely get a mouse anymore. The squirrel give us too much entertainment to get rid of them!