Thanks for the input from all....I have found the following: the dually has different front and rear hubs, the rest is the same for the regular pickup chassis. I can either switch the front and rear hubs, or use Hummer rims on the front (leaving the front dually hub as it), and either change the rear hub to a single, or leave the rear hub a dually, and get a shallow backspaced rim (someone said I could flip a Hummer rim on the rear and it would be about a perfect match with the front track)....Front is a dana 60, rear, 14 bolt....