The tires were Kelly, DOT date 4212, install date april 2013. Then it sat parked for three years. We had no issues with the tires on the two short check out trips. I checked and inflated all tires to 82 psi cold. The temperture on the day of the tire failure was 92 degrees. The tire store in Greenville, AL said it was belt separtion caused by them sitting for three years and the high temperture of the road surface. I will not make that mistake again, I could have saved $400 by having new tires installed before we left.