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Could you elaborate more? Perhaps a link to an image? I am struggling to follow.
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Search Google with 'GMC half-tonneau pickup' and the first hit is a very helpful aerohead posting:
Modding a pickup
...and on the Gale Banks website I find:
Don't ignore aerohead's post just because I posted the picture. It maps out a lot of possibilities for a pickup truck configuration.
Wikipedia says the half-tonneau was was OEM in 1998 on the
Chevrolet S-10 EV
I know none of this answers *why* it works. I'm going to stick with
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The air spills over the back of the roof and pushes on the back of the cab.
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Another great permalink from sven7:
US Pat 4,573,730. 4 Mar 1986