I have a Safari Simba and on a recent trip to MN. I had both tires on the right rear blow out' one had no air, which cause the other one to blow out. Coachnet found a tire service near Lamoni, Iowa ( We were really in the boondocks) who had two used tires which they changed on the side of the road. Two reasons for my comments, Coachnet really came through with expedited service. My tires were made in 04, but I only had 18,000 miles on them. On return to Alvin, I replaced all the tires, and all the valve stem extensions because they get old also