I'm, about due for new tire and would like to stay with the stock aluminum rims that I have (17x8). I would really like to go with the 285/75-17 dura grappler which is 2 inches taller than stock more for the looks than anything els (265/70-17 look a little small). I pull 10k toy trailer (loaded) and put about 10kmiles/a year with the trailer. Mountains are my concern with the setup I would have. WIth the stock tires, I pull ok in the mountains but not great. I have the 6.7L Cummins, 68rfe auto trans, 3.73 rear end and 4WD. I would sure appreciate hearing from anyone who has the 6.7/auto trans and 3.73 who has gone to taller tires who pulls anything of appreciable weight. I have 30kmiles on my tires and will be needing new ones soon. Thanks