Ive got a Ford F250, 2005 Powerstroke diesel FX4 Lariat 4x4 , that will run circles around your Duramax, loaded and unloaded, its got just about every aftermarket bolt on available(including propane injection), what the heck bring on a new C6 Corvette, i ate one for lunch not too long ago in my F250, plus i still pull my 31.9 foot fifth wheel toy hauler, i'll bet theres still enough power to spank your cheby when i'm fully loaded. Its better looking too
so bring it on.