[RMcNeal]

I would go back to an ST235/80R16, or the 85R16 if you prefer. The ST tires are specifically made for trailers. The 85's are 1/2 inch taller than the 80's, so not much difference. Also, if memory serves, the 85's add a slight bit more weight capacity, but you're still limited by the axles, so not really a factor. I plan to go to 85's when I replace my original ST235/80R16 Sailuns. My only reason is that I run a bit nose high, so the added height of the 85's will help get things towing more level.