Meh - too much BS in this thread. A basic box trailer, with a rounded nose, faired wheels, a clean profile and a tapered tail, and capitalise it to ride - at least initially (from it's front pointy end) within the wake, or the plough wave, of the towing vehicle.
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And it really doesn't have to look like a nuclear submarine - basic wind tunnel tests can be done on a kitchen table, with an incense stick, and a fan, and some scale models - a few blocks of balsa, some ice cream sticks and a bright light and some black paint...
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