I put 4 new carlisle tires on my 1996 26' TT last October (2004) I left Indiana in Mid-June and blew my first tire in Spearfish S.D. I blew a second tire on the North side of Chicago (Hwy 294, not much fun) on the way home. Last Wednesday, Oct. 19th I blew the third tire of the four I purchased 1 year ago. What is going on with these tires?? I checked tire pressure before I left last week on all 4 tires and the spare. I was only 1 hour from home....cool temps, running only 58-62 mph. I beleive that I purchased DEFECTIVE TIRES. Can anyone tell me the history of "Carlisle" trailer tires?? Thanks for your help!