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Every 4.80 size 2 ply tire I've had on that trailer, I've blistered. I may have went overboard on the tire but I went ahead and put an 8ply 5.40 size high speed rated tire on there. I typically tow at 70mph for many bours at a time which is pretty fast for those tires and also the reason I went with a larger and beefier 5.40 size tire. The bearings run warm but are never hot.

So far I've run the 8ply 5.40 tires round trip from Dallas, Texas to Atlanta twice and also round trip to south Texas in 100F+ heat and they've held up much better than the 4.80 2 plys I've used in the past.