Weight the trailer axles, then consult Sailun’s load/inflation chart. Looks like a classic case of over inflation to me. A heavy duty tire like the Sailun will wear off the outside edges of the tread when over inflated because the edges of the tread “scrub” as the tire rotates because there is less pressure at the edges than at the center of the tread. Passenger car tires are much softer, so they do the opposite.
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