Goodyear says the LT G614 RST is a "regional service trailer" and has nothing to do with a ST tire (special trailer).
I've ran into tire shops back in the '90s that said LT or P tires couldn't be used on a trailer.
I asked one dealer if that was a fed or state law or his store policy or just his opinion. He gave me the deer stare in the head light look. I thanked him and found a tire dealer down the road with experience in tire replacement for trailers. He mounted two LT235/85-16 E on one axle for me at my request. On my reload run I had the other four replaced with same size LT tires.