I picked up a 2017 Denali diesel. Love the truck but the odd tire size (255/55/20 = 31.1") leaves little AT choices. Has anyone with 20s gone to 275/55/20 or 265/50/20? My concern with the 265/50 is an even smaller sidewall. With the 275 would be fit and mpg. The diesel sits pretty close to level as is with only about 3/4" of rake. What have you guys made work?