Bringing Trailer in for Service - Need Advice

I have to add to the rodent issue which was not entirely addressed. How are they getting in? When our unit was brand new, the first trip out to Yellowstone revealed chipmunks, yes chipmunks were getting in our basement and up to our fresh intake under our fridge and chattering away at our dog! Drove her crazy. After that trip, we got under and filled in every space around pipes, etc, with expanding foam and in the basement jammed steel wool in gaps between the basement compartments and covered the heating vents to the basement with fine wire screen and also took off the fresh air intake cover and covered the back of it with the same fine mesh wire. Never have had a problem with rodents of any kind since and we regularly inspect. Oh, and just a note of how they can destroy things if left alone, when we had some repair work done, years later, the techs found a stash of dried mushrooms in the wiring harness. There were enough mushrooms to fill a plastic grocery shopping bag!