We recently put our 5th wheel in storage on a farm field in southern British Columbia. The owner warned us that mice were a problem, so we set out four trays of blue poison mouse pellets. A week lat...
I use traps, pail with water and peanut butter spread down from top edge about 2 inches. Set this up just inside the door. Cut two pails down some and set landing gear in the pail and then add antifreeze or oil etc.