Get four 15" radial truck or car all season tires. Will pull better, not speed limited and far easier to balance and pull. I switched my dual axle boat trailer, 5200 lbs loaded, over to 14" d rated radials, rated at 2200 each on dual 3500 lb axles, a number of years ago. The improvement in pulling was hard to believe and they don't heat up at 70 MPH. Wear much better and stay balanced. No blow outs, flats or weird wear since switching.
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