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Low pressure isn't the only cause of tread seperation. Your typical tire is four ply. 2 plies go from one edge across to the other. The next 2 plies are laid in the tread area. When this type of tire is used on a tandem axle trailer the tight turns literally rip the top plies loose. Goodyears fix for this was to add a 5th ply over the other 4 that also goes edge to edge and helps keep everything in place.
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