I got the 385/65R18 Nitto Trail Grappler M/T installed and have put a couple hundred miles on them. They are surprisingly quiet on the highway which surprised me. They claim they are quiet for an MT and thats actually true which I like. They look great and add a much tougher look to my pickup. Its hard to see in the pics but the aggressive tread and knoby sidewalls make a big difference. They are also about an inch wider and an inch taller which helps fill the GMC fender wells. (anyone with this body style has probably felt my pain wth th design of the fenderwells vs. actual room for tires to clear on a turn. I did a little fender trimming on th inside inder the liner then heated the liner wth a heat gun and changed the shape of the liner to fit my cuts I actually gained about 3 inches so I could have gone bigger. I havent had them off road yet but they pick up about everything I drive over. My one complaint is th tires are not true to size the were supposed to be a half inch wider and a half inch taller all in all I am pleased.