Well, I didn't get new tires today. Ordered 285 KO2's on a deal from Costco, went to the install appointment today and they refused install. Apparently they've had a long standing policy that they won't go over 3% either way from OEM size. 275 to 285 is just over 5% according to their calculator. This is despite the fact that the truck currently has 285 Revo's on it that they installed, as well as the KO2's (285's also) the set before that. Counter guy said it's ultimately tire manager discretion. Going to call around to the other 2 Costco's in town to see if they have different discretion, but bummed if they won't, Costco's road hazard warranty was excellent.