To me the answer seems obvious ... with so many rodent control products available these days at a reasonable cost why not just pick one and use it anyway, regardless of where you park and for how long. One winter I did have a mouse (or mice) get into the ducting of our KZ Spree during winter storage and the smell when I tested the furnace in the spring was unbelievably awful. :E The only way I could completely solve the problem was to replace the ducting entirely ... since then I always keep a couple of packets of
Fresh Cab Rodent Repellent in the trailer, year 'round. Why not? ... the cost of doing so is insignificant compared to the potential cost of damage mice can cause in a trailer and although I wouldn't say it's a 100% guarantee at least I've made an effort. What I can say though is that since I started using Fresh Cab I've not had any further mouse (mice) issues. :B