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Needz collapsible boat tail like tractor-trailers, otherwise not all THAT aero but it's a tough job to make them aero and functional. The belly pan is probably the most aero thing about it. As Hucho points out, excess front radius beyond that which promotes good flow down the sides and roof doesn't make it more aero; in fact it may be less aero because, in addition to the extra long tongue, the tow vehicle/trailer gap is larger and that's an aero no-no. Probably costs more than my house but it looks quite nice.
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