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My $0.02 - don't forget crosswind stability.
At issue is the tendency of a car in a cross wind to steer into the wind (stable) or away from the wind (unstable). Those familiar with Hucho know that a square-cornered box is stable, and a sleek teardrop is not. There's a reason Porsche 911's all have wings.
Looking at the trailer lead edge treatment, I'll wager the open end has the beneficial property of increasing drag in crosswinds. That's the trick; you can get stability from a low drag body by increasing drag in crosswinds.
This isn't something you want to learn on the road...
HAve fun,
Frank
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