I got the Ricksons 3 weeks ago, and I now can haul my heavy and I mean heavy truck camper 75 mph and not get heart burn worrying about the overloaded rear tires. For tires I have Michlen XZE 245 X 70 X 19. 5. I just got back from a 450 mile trip and they hardly got warm. The XZE is a highway tread, but with 4 wheel drive I don't see a problem.
Tim