Our camper is stored at home outside, but we keep Decon mouse bait pellets in the garage next to the camper. Never have a mouse problem. Don't know if the pellets are the reason, but they disappear, so mice must be attracted to them and not to the camper. Then they go elsewhere to die.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.