Running Goodyear Wrangler HT LT235/85-16 on a Fifth wheel and Gooseneck trailers. The Gooseneck tires will be 6 years old this summer. Will go with the same tire. Been perfect, no issues or complaints. Trailer is within weights for an LT tire.
Did a lot of research on LT vs ST and the only things the people at the tire stores could tell me is that an ST tire is made for a trailer, vs an LT for a truck or vehicle, so more attention to traction vs going straight. In addition, ST tires are not tested LT tires are.
For me, last time around Goodyear Endurance was about $15 more per tire, so cost was negligible.
You also get a 20% discount on Goodyear if you are a USEF member.