*EDIT* this is a used 5er that we will be purchasing from owner, that has had it sitting on jacks on a concrete slab of a campground for over a year or so!!!! I know, the great Tire(d) debate/re...
We never cover our tires for the 6 months in Az. I do cover them at home because we have the covers. I use plywood under the tires when not on the road. 5 years old in June of 2015 and the tires look as good as new for wear and looks. Just bought a new spare to replace the 2007 that never saw the sun.