I have the 35/12. 5R17's on mine right now, they have been on the truck for about 25k. mi. and probably will make it another 10K. I think I have one that is out of round, but it only vibrates @ 40 mph on the rear. if it is on the front, it doesn't seem to be as bad if at all. They are working fine for me but I am not going to get another set, I am going to get a set of Toyo open trail M/T's next. the BFG's are load range D 3000 lbs @ 50 psi, and the Toyo's are E range with a 3415 lb weight rating I believe.