' tail '
An awning company could make a lightweight 'skeleton' with a tensioned-fabric 'skin', with better aerodynamics offered in any available commercial product.
Mounted from one side, on a swing-away spare tire arm, as on some JEEP Wrangler rear bumpers, it could easily be un-latched and moved for ingress/egress.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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