Ed, I would make any nice aero shape you want so long as there are a minimum 2' tall straight sides on it, and then make it a two piece slider or pop-up. I have several ideas regarding hard sided pop-ups. No fiddling, no tent section, just slide it up or down in a hurry.
Stand up = momma happy
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears