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I've been looking for pics of a Dodge diesel that was modded for mpg, but the article you linked wasn't it. It was lowered and had a custom massive NASCAR-style front air dam that replaced or covered the entire front bumper below the headlights/grille. It also had a GearVendors overdrive unit. I don't recall what their claimed mileage was, but I think it was right near 30mpg highway unloaded also.
Do you need the dual rear wheels? That's a huge frontal area adder and probably hurts Cd as well. The dual fenders are fiberglass or some composite, but I don't recall how intact the normal bed side is underneath. I know you said you tow, but unless you tow the trailer a lot at highway speeds and it's heavy you don't really need the stability of the duals. You could swap out your dual axle for an axle from a 2500 and convert your truck to a SRW3500. I'd recommend swapping to the 2500's wheels at the same time to cut down on the front wheel's profile. I have seen a DRW pickup with a narrowed axle and straight bedside, but I didn't see inside the bed to determine how much space that consumed. I imagine it took at least a mini-tub out of the bed floor.
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