Keeping mice out/away of racecar trailer

Great feedback guys, thanks!

Cats are kinda outta the question for now as i have two dogs that go nuts at the site of other animals.

The decon thing crossed my mind too, that I dont want them dying up in the headliner or under the carpet.

The peppermint oil and dryer sheets may be worth trying, thanks.

The sonic electric thing I always wondered if they were BS or not.

Thanks again all!!!