Got mice try this

I made that years ago with just a 5 gallon Lowes bucket and a piece of 2x4. Works like a champ on chipmunks too. I have seen it called the 'bucket-o-death'.

Or save a lot of money and plug the holes in your RV.

Adult mice can squeeze through holes no bigger than a dime, fill the gaps between wiring harnesses and plumbing that go through to the outside and you won't be bothered by mice inside.

One of the simplest traps is to put a layer of vegetable oil and some bait in the bottom of a large bowl. Place something for mice to crawl up into the bowl. They get covered in oil and can not crawl back out

Or DIY with the few items sitting around the garage.