Pardon my presupposition.
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The tonneau was 50/50 I need something to cover the bed and keep stuff mostly dry during trips. Worst case for long drives without needing the bed I can cab up a half cover for the bed and a custom headache each with a fin for the rear cab spoiler.
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It folds in half? Here's a golden oldie:
edit:
Camping World Cup trucks use a simple spoiler that follows the 12° rule.
http://www.rantsports.com/nascar/wp-content/slideshow/2012/11/top-five-future-sprint-cup-series-drivers-from-the-camping-world-truck-series/medium/ty-dillon2.jpg
No reason why the spoiler couldn't be clear plastic, and/or retractable. It doesn't need to be a rectangle, a half-octagon or curved arc would have less frontal area, and conform to the vortexes that stream off the back of the cab.