I can attest to that MeAgain. I just replaced my last ST tire. We had Tow Kings originally that came with the trailer, then Akuretes, which did last a whole year! Then a Tow Max that lasted 2 400 mile trips in one year before disinagrating. I keep them properly inflated before each trip. I have a good gauge and my own compressor. They are covered when not traveling, and I never go over 65mph. Oh, but there must be something else I'm doing wrong, he says. Or they wouldn't blow.
I am trying Geo STar 574 LT 235 85 R16's 14ply LR G tires. I have 7000lb axles and about 12,500 on them total. The old E range should have worked great, but we went through 7 tires in 3 years. Luckily only one really blew, the rest had leaks in the sidewall or stone bruises we caught before they blew.
Personally, no matter what kind of tire I have in the future, it will be one load range above what is needed just for piece of mind. I go in tomorrow for an estimate on the skirt damage from the last blow out.