Late to reply on this topic. We had almost 9000 miles on our original E rated Marathon tires. Looked new little tread ware, but I got spooked before this last trip. Bought G614 and after 10,000 miles they look new. I noticed the sides don't have much tread anyway, perhaps by design? They held presure and gave me more confidence. FYI I got $450.00 for the E rated tires on craigslst. Told them why I took them off, was very upfront about them and showed them my RV, first guy bought them, said they were way better than the tires he had! ! I will say this, I saw lots of pretty sad looking trailer tires on this last cross country trip! People do take chances!
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