I did an overlay in CAD. I can't figure out how GM gets the dimensions that they claim for the Hummer, specifically overall length. They list it at 216.8 in, but when I scale for the wheelbase and tire size, I get 211.8. The Silverado measures right at 231 using the same scaling, with a 148.1 in wheelbase (MT published 145.7 though). Would sure be nice to get some actual numbers from GM.