The worst starting point for the center section of the trailer would be a rectangular box
Not saying it can't be done; you could add a radius equal to half the trailer width on the front top and sides. It would look like this:
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Any references, information or educated opinions about which way I should go?
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It's hard to know where to start. Maybe with the tow vehicle? The Silver Streak Clipper pictured doesn't even have side-to-roof corners. But it might experience lift from side-winds. A trolley top would fix that. "An aerodynamically slippery ultralight fifth-wheel travel trailer" isn't going to be a box, it will want to look like an Art Deco zeppelin, so let it. Here's a design for a Class-A motorhome conversion, but it could be adapted to a 5th-wheel.
