I replaced my cheap china bombs on my trailer back in 09 with a set of Carlisle load range E ST tires. I did alot of research and what i came up with was that the biggest failures were in the load range C and D tires, very rarely did i find a complaint about the E's. Mine are 4 years old this year with approx. 10k miles on them. Just this past july i had to replace one due to a shifted belt. That failure i blame on myself for running at 70 mph on occasion. So next spring i will be getting 3 more Carlisles to replace them.