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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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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