Just info for anyone reading this thread. I have been running LT tires on both my 5th wheel and a gooseneck trailer. The LT tires are within the weight load rating of each trailer - also both 16". But for those doing research, LT tires are tested and true since they are truck tires, ST tires are not tested to the same standard. The are trailer tires and are designed to run straight. Yes, there is some comment about sidewall strength. But, do you think an LT tire does not have the same sidewall? It absolutely does and better, they are designed for on and off road truck usage. Ask any reputable tire dealer about LT vs ST, the only thing they can say is that an ST tire is designed for trailers and trailers mostly go straight. An LT tire is tested to much more stringent tests and will outlast an LT tire. Do yourself a favor and take a look at an ST tire and LT tire not mounted, the LT has a much stronger sidewall and overall better built tire.
On my gooseneck, the OEM tires lasted 10 years and only traded out due to cracking. I have learned a lot about tires and will not go that far again, but at 5 years old, I can sell them to some guy that needs good tires for his truck for $50 bucks a piece and he will get years of use before ever having an issue...
Just for info - I am running - Goodyear Wrangler H/T on both trailers.