I'm thru taking the fiver out for the winter. Probably won't go out again for 5 months at least. Do you raise your rv so the weight is off the tires? I never have in the past, but at the price of tir...
If your main concern is the tires you can always get a cheap used set of tires and wheels to put on when sitting for long periods. This way the trailer is still movable if needed.