I starting my 3rd season on these 12" load range C Loadstars and they're great. No complaints at all. They've even seen some 2-hour trips at 65+ mph and then gone offroad for a mile of rough fist-sized gravel and then over the bank into the farm lake. My 1648 is heavy with added decking, carpet, 3 60-pound batteries, a Maxxum 70 and all the junk I take.
www.etrailer.com/Trailer-Tires-and-Wheels/Kenda/AM30820.html
Fwiw, they came inflated, but not to 80 psi. I always run the max.