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I had the Michelin xps ribs on a previous rv with 6,000 pound axles and they were every bit as good if not better than the sailuns I have now on 7,000 pound axles.The 10 ply Michelin's weigh the same as the 14 ply sailuns at 62 or 63 pounds. The Michelin tires are all steel tread and sidewall as the sailuns also. I prefer the Michelins at 80 psi over the sailuns if you can only put 80 psi in your tires because of the air pressure restriction. I would consider 30 psi below maximum 110 as underinflated.
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