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Old 09-04-2012, 07:42 PM   #2 (permalink)
Sven7
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Triangular plywood topper coming down at a 15* angle on top. Make sure the edges don't stick out past the cab.

A tarp has the possibility of flapping vigorously in the wind, negating gains.

You could also just cover the rear half of the bed, like a half tonneau cover. This would leave the forward half next to the cab open. GM filed a patent on it in 1984- covering only half may give better gains than a full tonneau.
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