I did one pull with it last fall that was a 400-mile round trip. Winds were gusty at 30mph+. the rig towed great. Minimal to no sway. Because of this, I am inclined to stay with the E-rated tires. They are about $50 a tire less. However, I am curious if the stiffer sidewalls in the F rated tires would have better performance in high side winds, or should I go with the F-rated just to get the added strength/quality?
Agree its time for new tires.
I would stick with a good ST load E tire on that triaxle. If the trailer has a 20k GVWR. Even at full 20000 lbs = around 4000 lbs of pin weight which leaves around 16k on the axles....or around 2600-2800 lbs per tire.
You sure don't need a load G tire at 4080 lbs per tire/110 psi. Load G tires are better suited for trailers with 3500 lbs plus load per tire.
The 16" Provider ST load E tires from Taskmaster....One of the first ST class tires with the new higher speed rating came out in the 2010 era on commercial trailers and proved to be a good tire for shorter mileage haulers (30k-40k miles).
If your trailer has 6k axles then the commercial grade all steel ply carcass Bridgstone R-250 or the higher price Michelin XPS Rib both in a LT235/85-16 E with give the trailer 18252 lbs capacity. These tires with their thicker tread depth are running 50k-60k miles on trailers.
Much depends on your trailers axle rating and loads per tire.