X2 what Dick said. I had the Marathons on my 2011 Mountaineer toyhauler and about 10K miles on it before trading in on a 2013 3100RL. I put 15K miles on the 3100 before upgrading to the G614 tire and never had a moments trouble with either trailer because I was well within the load limits of the Marathon and I am also religious about proper air pressure and not exceeding the rated speed. I think they are great tires but don't belong on the heavier rigs.
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