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On, say, a van or Volvo wagon, I think it would be cheap and easy: Use Coroplast panels to extend the lines of the sheet metal aft, attached with duct tape, and with a self-inflating fabric panel to enclose the rear. Self-inflating like the shirt of a motorcyclist, which balloons out behind.
Actually, NASA already did this years ago with tractor trailers. The bag would self-inflate at speed, reducing drag in the process, but droop down when the truck slowed or stopped.
If you put, say, a bike rack on the back of a Volvo wagon, this thing would cover the bikes and protect them from the weather and road grit, while streamlining the vehicle at highway speed.
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