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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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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
I'd like to think that people might open their eyes at some point... instead, I find it more and more likely that I'll just close mine.
-- Author kept secret.
Je ne veux pas d'une meilleure vie. Je veux être heureux avec celle que j'ai maintenant.
(I do not want a better life. I want to be happy with the one I have now.)
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