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Know what a hip roof is? If so just do that on the front of the box.
IF it were my truck, I'd take the top corner off the box. Might have to spend a little on rounded corners (don't know what they cost), but in the long run that seems like the best solution to me. I don't know how long you plan on keeping the truck, or how often you plan to take the highway either.
Go get 2 large beach balls and about 10 rolls of duct tape. Secure the inflated balls in the center of the space about 2' apart. Use tape to form a skin over them to the body of the truck. Saw this done in a wind tunnel........... You don't want something wedge shaped, you need something rounded.