Ours must have been over 6 years old when we had our blowout. I think they were the original tires; we bought in 2003, and our TM is a 1997. Those 6+ year old tires looked brand new. Now we have 2 year old tires, and they don't have very many miles on them, either. So now should we buy new tires in 2 years, or?
I wonder if it makes a difference how long you let your trailer tires sit in one position without moving. Our TM will sit for 5 - 6 months at a time in the same spot. Maybe we should move it around more (or go camping more
) . I check the air pressure before we take off on a trip, but it's never down by more than 2 - 4 lbs.
We have a cover over the TM and it protects the tire on the southwest side from the sun (no sun from the east, we're in a valley).