"Avoid putting the bait in the camper - it will draw the rodents into the camper to get the bait. Use the outdoor bait containers (designed to prevent other animals from eating the bait). I put those next to the jack and wheels, where rodents can crawl up into the camper."
Tvov--what outdoor bait containers would you recommend? We are in Canada, so our products may be different but I'm sure I can find comparable items.
Good advice about not putting the bait in the trailer, and about the consequences of poisoned mice and their predators. I'm also amazed that the mouse had the energy to stash all that food in two different places.
Will also look up peppermint oil. Thanks, everyone.