Hi Mary,
No bills for retirement!!! Fantastic!
Condensation is one thing you might be cognizant of. Travel trailers are made fairly air tight. I realize Idaho is a dry climate, but cooking moisture can accumulate. Cracking a window might be advisable.
Instead of jacking up the unit to save tires you might consider taking the wheels off. Wouldn't be as high. You also might consider some kind of skirting (or straw bales) to keep the cold from underneath.
Having a lean to over the top is the best tjing! Sure saves you from a lot of maintenance.
Best of luck in your retirement!
