My door sticker says 65 for front and 65 for rear duals to get rated carrying capacity. I never saw any wear issues on the factory installed tires and no wear issues on the michelin ltx ms tires now installed.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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