My “latest” tire experiment are G rated Greenball towmaster ACS 235/85/16. I run them at 95psi cold and have 8500 miles on them so far and they are doing great! In a max effort to get three years out of a set of trailer tires I removed them memorial weekend and have stored them inside. I’ll put them back on the trailer prior to Labor Day weekend for our 1300 mile trek north to Thunder Valley in SoDak . I live in trailer tire he77.... road temps can reach 150 degrees and we often see tire temps in the 160+ range. Across Wyoming we’d see 80-85 degrees. I’ve never gotten three years out of any E rated tire I’ve ever used. Two years for sure, but that third would involve a tire failure or two. I always carry two spares so the purchase of 6 “G” tires was quite the investment.