Quote:
Originally Posted by BamZipPow
Sorry Bob...no one to help me but me. 
This is the piccie of the hatch being pressed down while in some cross winds and an 18 wheeler in front of me...I had 3 sheets of Coroplast on (but not laminated together). I believe I didn't have my ducktail/rain gap cover on at the time so air could've been gitting under the aero cap. Speed was about 65mph.
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I'd gladly help but you're too far from IL.
I'm not seeing a big problem in that pic though. I originally thought you meant a big section in the middle was pushed down. So it's really asymmetric?
The neat thing about true compound curvature is that once you have it the shell strength is much more.
My Scamp trailer is an excellent example. All molded fiberglass and only about1/8 inch thick. Large flat sections without windows or inside cabinets attached are flimsy. Simple curvy areas will give a little but not much. Compound curvy sections are amazingly stiff. Geometry rocks!