I have found evidence of mice in my 5th Wheel. Know they have climbed up the landing gear, but can't figure out how they got into the living area through the front storage. I have checked for holes and have found none. Any suggestions?
If you look for light leaks when it is dark on the inside and light outside and the other way as well, that is the first hint. Use that expanding foam to seal any openings. They also often get in through the opening for the sewer hose if your tanks are in an enclosed bay. You can stuff steel wool around the hose opening to stop them. The steel wool trick will work in any opening that you can't close forever.