2011 limited max 4wd, i have a sticky situation. Door sticker shows 275/55r20, google says 275/65r18, 275/55r20, and 265/70r17? Heres the kicker- i have 275/75r18s all around, including the spare. DOT date on spare tire is 4210, so middle of october 2010 manufacturing date? Possibly original...