Hi, I have a 2014 Silverado (5.3 - 342:1 ) with stock 265/65R18 (31.6") tires on it. I would like to put a leveling kit (2in) and 265/60R20 (32") or 265/70R18 (32.6") tires on it. Would this be detrimental to the truck in any way? I don't want to alter the ride or mpg too drastically. I also tow a trailer that weighs about 8,000 lbs full (only tow it 2-3 times a year and mostly flat ground). Do I need to have it retuned after?