Just out of curiosity, I would like to put a set of BFG AT 315x70-17 on my 2007 MegaCab. Could someone recommend to me the right amount of front spacer and shock combo, and possible what wheel offset I would need? I plan on running AR 17x9 wheels, and then change over to Airbags in the rear. Any suggestion would be awesome…. . I don't wont to be to tall since I still would like to be able to tow my 5'er