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A small trailer totally in the aeroshadow of your vehical, should not add air resistance, unless it begins far enough back that the airstream has begun to converge to the point that it slams into the front of your trailer. The best design would be one that catches the airstream just as it begins to drop, and guides it to a taper at the rear of your trailer
There are many ideas in this forum, as well as a template in "Garage and Tools" If you don't want to do the curves, a straight taper would be an improvement over a rectangular prism of a box.
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