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Old 11-04-2009, 12:24 PM   #7 (permalink)
Christ
Moderate your Moderation.
 
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Some people have tried saw-tooth edging on square edges, I haven't tried it myself, though, and haven't seen any evidence that it works.

Does the door open like a barn door, or does it fold down completely? (Assuming there is a door on the back of the trailer.)

Either way, you can add like a 2" extension that slopes 12* from the top, 12* from the sides, and probably not more than 3* from the bottom. You can make a sloping box out of it, that will decrease your cross sectional area substantially and help to train airflow to a close, rather than leaving a more turbulent wake.
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