Hi Gerald, here are a few ideas that may help, but you basically need to block every single spot they can get in. Anything smaller than a dime sized hole.
Here’s a bunch of tips that worked for us: https://www.frugalfamilytimes.com/2018/10/how-to-get-rid-of-mice-rodent-proofing.html
Hi Gerald, We have a cottage and have done these things to help... make sure there is no food, bars of soap or tissue paper of any kind (kleenex, paper towels and toilet) paper left. Use steel wool to plug up any holes or areas the something tiny could get in. Leave wax paper with peppermint oil on it in any area that they might try to go. (they hate peppermint oil). We also set several traps just in case in any spot they may make their way in. Hope this helps!
Here's some advice.
and a video.....
This might help! https://rvshare.com/blog/how-to-keep-mice-out-of-your-rv/
Get a cat :)
What you can do to find the holes and cracks is to wait until after dark, have a lamp inside the trailer you can turn on. Go outside the trailer and look where the light comes through, that is where you'll have to block.
Hello Gerald, hope this helps you out,
Hi Gerald, hope this helps you mouse proof your trailer. Good luck
camperguide.org › how-to-mouse-proof-a-camper
Nov 9, 2017 — 4 Steps to Mouse Proofing your RV · Step 1: Eliminate Mice Problems You Already Have · Step 2: Take Out Unnecessary Items From Your Camper.
Seal and caulk anywhere air can get through. Make sure all plumbing areas are sealed and you can't get air in there as well. Cinnamon and peppermint are scents they do not like but aren't too over powering. You can also put out poison. I have found "just one bite" to be the most effective.
Make sure to remove all food and seal up all possible openings well.