Just outta curiosity, what kind of hit did you take on your fuel economy? And have you been able to correct your error in your speedometer with the larger tires?
I put a set of black 20x9 xd monsters with a stock size but more aggressive a/t tire (winter wheels) with no suspension mods and lost around 1-2 mpg.....that's just an estimate because being winter the truck runs abit more warming up.