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Hello Nubbz, I put a similar top on my pick-up and wow what a difference! I think one important component you might want to look into it how to maximize a clean airflow separation at the back. I extended my cap 8 inches from the end of the truck and I think that helps a bit. On the Volt video on this website, a designer talks about putting a thin, 5mm? dimple across the back for better separation, and said that little feature went a long way. I've also heard on this site, 10-12 degrees should be the angle you're seeking. If you go straight from the cab to the gate, it'll be more, maybe 15, and those few degrees cause are detachment over the topper, increasing drag. If you measure the lengths of all the sides, you can type it into an internet angle calculator to get your precise angle.
Cheers,
Cons
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