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Just thinking out loud here.......Maybe heavier duty tires....Maybe an extra helper spring or 2........3500 i believe has a long bed option.........Maybe different gearing.........Maybe different programing on the different control modules. .......
Not sure how relevant to more modern trucks, but I know mine had an option code for HD suspension leading me to believe there is a lighter duty option for even the duramax. mine was definitely 3500 series springs on a 2500 truck, but it was an '03. I think that the newer ones are all built the same suspension wise but like Don stated, simply a dually vs. single option.
Wilbur, Are you looking only new? Or a specific Duramax engine version? No DEF... etc..