I think the best thing you could do would be a kammback. That way it will make the aerodynamically "ugly" shape into a usable wagon form. If you look at "A" in the diagram it has no vortexes coming off the back.
Winglets would be interesting and if you feel like experimenting by all means do it. I'd like to see what happens. But I've never heard of a ground vehicle using them.
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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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