Sorry, was just going by the weight you stated but yeah you probably got 7k lb axles and at the gross of that trailer sounds like the only choice you have is G rated tires. The ST tires they put on it would be at their max, kind of cheap of Keystone to even sell it with those tires and that gross weight,,,,no, not cheap, irresponsible is more like it.....Even at that rate LT tires would have out performed the Marathons.....lol