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Make the grill block easily removeable, so you can use it when empty.
Side skirts would probably help. Beware of ground clearance. Big rigs use a somewhat flexible material so it will bend out of the way. Metal sideing probably won't be as forgiving.
Try to smooth out the transition from the cab to the front of the toolbox. It appears to be a big flat edge. I know you don't have a lot of room to work with there.
Make a removable AeroCap. Something with a stiff, light framework maybe with some quick release fasteners and hinges. You need to be able to break it down and store it when the truck is loaded, maybe under the bed. A sheet metal box that it can slide into. Although it would be nice, you don't necessarily need to see through it, you can't see through the buildings when loaded.
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