Sailun S637T overkill for a trailer with 10,200 gvwr?

One thing to remember, ST tires are usually rated at 65 mph at max pressure. With 6000 pounds of capacity, I am running at just over 50% capacity of the tire. I have been running my combo for over 2 years now, the tires run cooler, my ride is substantially better, and the wear is so much better. Even if it is over kill, the economics are too good to not do it.