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Like folks have said, the real killer is the tire construction and the weight of the larger montys affecting the marathon...And I would add how they heat up during travel. Monitor tire temps... I was seeing temps into the 140's with them. And I can say that my new tires run way cooler and the monty is much more "quiet in its movement" when towing than the old marathons. John
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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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