[Kid1956]

go to Walmart(or..) go to the spices isle, find the bottle of Peppermint Oil.
Bring home and mix 50/50 with water, in a spray bottle.
Once the trailer is parked.. spray the bottom 6" of the tires, jacks,, foot or so of hoses and cords that touch the ground. Mice hate peppermint.. its real..

I found it on the internet 2 yrs ago. I spray my garage entrances, and around the edges,, havent had a mouse in the garage for two years...