[Bicycle Bob]

The front end on that trailer is designed for adequate strength with a minimum of material, plus a window option. The recessed clearance lights are the only feature that might have been done for airflow.

Perhaps the best thing we could do for the trailer industry would be to make a kit of parts that would create a fairing to the tow vehicle. That would be better than having everyone make Airstreams. I'd start off by trying a big Coroplast box over the trailer hitch, flush with the sides, designed to support the back edge of a big cone attached near to the maximum diameter of the tow vehicle. The cone would only need a bit of bungee cord to keep it in shape, since air pressure would help hold it in position at speed. If wear ever becomes a problem, an extra skin could be stuck on.