Well, before y'all dismiss ST tires, we've had Marathon ST 205/75R16 Load Range C tires on both our 5,000# 22ft. TT and our new 7500# 28ft. TT and have been around the country with both trailers with nary a problem. I recall a tire seminar where the mftr. engineer claimed the ST tires have more anti-ozone chemicals in them since they sit more than trucks, and I think I recall the sidewalls are somewhat thicker than LT tires because RV owners tend to scrape their tires more on curbs and such. FWIW