You can do many things with varying results. Some of the more common are.
+ Seal all entry holes. Very difficulty since mice can fit though a half inch hole.
+ Set traps and sticky paper. Good but hard to put in very nook and cranny. Plus you have dead mice decomposing in your TT.
+ Set food or poison on ground outside the TT. Bad for other critters.
+ Remove ALL food. Kind of a no brainer.
+ Dryer sheets, audio devices, commercial chemical repellents and many home brew concoction are recommend. They seem to work to varying degrees.
+ Other suggestions include eliminating all cords, ropes, straps an such on the ground. Cats in the area. Flashing lights ad infinitum.
Personally I had one winter with no mice. One winter where they held their State mouse convention in my sink.
Good luck and I am sure you will get lots of suggestions
Twenty six foot 2010 Dutchmen Lite pulled with a 2011 EcoBoost F-150 4x4.
Just right for Grandpa, Grandma and the dog.