I buy the same size trailer tires as yours but I get the E rated tires, I hate tire troubles Your always(out here anyways) 300 miles from nowhere when the darn tires blows out My 24Ft Pace weighs right at 8600 on both axles and it adds 1000 to 1200 lbs onto the truck weight when it is going to the track My E rated tires call for 80 lbs cold, I run them at 85 lbs cold to start with, I have check them warmed up, 300 miles down the road in the spring with 85F air temps. and they gain right at 5 lbs I have blowned out C,D and E rated tires Towmaster and Carlisle as well as a couple of Goodyear Marathons Most of those tires had been on one of the car trailers for two years or more and I lived in the Mojave Desert back then, some of them didn't have 5000 miles on them when they went out Buy the best ones you can get and pray for good luck