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You guys are all making this way too complicated: Just look to those self-inflating parasails or parachutes for the answer, where the leading edge rams air into the internal channels to inflate and stiffen the sail. Made of inexpensive Dacron, one could taylor a very aerodynamic bed cap for a pickup truck, a boat tail for a car, truck, or motorcycle, or whatever.
Deflates when you slow down and falls back into the bed of the truck.
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