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20's are the biggest that (to me) look good on our trucks. Low profile tires on an 8,000lb truck looks.... odd .... to me. I almost bought an Ex with 22's on it because of the price, but was immediately lining up "normal" shoes for that. Both my F250 & Ex are diesels riding on 16" wheels, and 18" will be the max. My truck isn't worked hard very often, but still, my purchases lean much more towards functionality rather than cosmetics. I'd go with the 18s and go with tires that can handle more load.