I had a set of China bombs on my current trailer. They lasted all of a year and 300 miles before i found a shifted belt!. I replaced them all before the next trip. I replaced them with Carlisle RH's LR "E" those I got about 8k miles out of before I found a shifted belt. So I replaced them with another set of Carlie's just last year. Not all failures result in a blow out. Yes I do tow near 70mph and in high heat (mid July temps near 100deg!). 5 years is about max for a set of trailer tires anyway. Many people that have a failure come and complain about the junk tires. Truth is manyof those failure are in tire well over 5 years old!