I just spent a half day yesterday closing up holes on our brand new Jayco Eagle HT 29.5 BHDS. I climbed underneath and identified openings, as well as identified openings in the basement and inside the RV. Once this was done, I used spray foam to seal them up. There were also a couple of spots like in the battery compartment that I couldn’t close and inside the basement where wires can go through the floor for outside TV, so I used steel wool on those spots. While I was doing this, my wife spread dryer sheets throughout the RV inside and in the basement to keep mice away. We didn’t use moth balls, because that smell takes a long time to go away, where the dryer sheets smell good.
The RV will sit from now until March or April, depending on how much snow we get here in MASS.