Rounding the front would still be better than flat...template. Perhaps filling in the gaps between the box corners and current fairing. You could add a streamlining box to the rear like over the road semis have started doing. The panels could be made to fold up so you could fold the door down.
Or go extreme, and cut the top off of the box even with the cab roof, and make it extendable with panels which overlap the lower sides of the box, like the old Alaskan campers. Cover the roof with solar panels, put some deep cycle batteries in the bed, run all the truck electrics off them, and delete the alternator. With an inverter you'd have 120 volts to run power tools at the track if thats what you need.
If thats too much, put larger radius's on the upper box corners, and make the box roof slope down starting a few feet behind the front edge, till its a couple feet lower at the rear, and still open like a hatchback to full height.
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