Here are some more observations on these LRG S637 tires...
Over the last 6 years or so, we have sold HUNDREDS of Sailun S637 tires in the 235/85R16G size. First the LT version, and more recently, the ST version.
Same tire, different designation.... and yes this change in designation was indeed done to beat the tariff on LT tires and keep them reasonably priced. The tire was not changed.
We have sold these tires for all kinds of trailers, Stock trailers for ranchers, Toy Haulers, RV trailers, Stacker car trailers for race cars, Open car trailers for hot shot haulers. There have been a bunch of repeat customers over the years, and for many commercial type users, this is the only tire they will buy.
My point is, if your considering the Sailun S637, do it. A year from now, you will be back on this forum telling others about how well these tires have worked for you!
One note of caution: be sure your wheels are suitable for the higher load capacity and 110 PSI pressure. This is important.
30 years in business on my own, with over 40 years of doing tires!