^^^ OK, that makes a lot more sense. Heck we went 7, 8 or 9 years (can't remember, I'll have to check) on all 6 of our last set, but ours is also garage kept so they never see sun unless we're out - and they still were in good shape.
As far as blowouts, we had one blow out while parked in the garage, and I fixed the damage on my parents when they had an inner dual go. The damage wasn't pretty.