We know that, but he didn't even try.
A sheep wagon is a narrow bed with sideboards topped by a bench that runs over the wheels; with a bow-and-canvas top. If the benches had a curved outer ends and the front and rear bows were somewhat smaller that the middle ones, then the resulting shape would be Airstream-ish. More interior volume for the same drag?
Or even U-Haul type construction, with a frame of sheet metal quarter rounds.
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