*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...
Been East Coast to West Coast and back. Been up and down the east coast. Hot in the desert, cold in the mountains ! 12,000 miles and TowMax tires did just fine. Maybe luck ? Who knows. Would not concern me a bit to keep the tires you have. Maintain correct PSI, do not overload and do not exceed tire mph.