Well, I won't be using coroplast, I'm using a roofing material that is fairly beefy and is pretty stiff. I may back it up with someting, but i'm fairly sure the curve is going to give it some good strength as well.
Also, Frank Lee, ty for the link... I HAVE read that, but this was a specific question as to the better design - curved with bumper, OR, the straight down and across design implemented in many trucks/suv's today.
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