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Read through all of this and was wondering if your design might work for the back of trucks with shells on them? Also read about the new design one that has a complex shape that is supposed to work for vans and so forth. (the yellow drawing on pg 1)
As to how to adjust the angle (up or down) I would think using washers between the mounting bracket and roof would work. More washers up front to angle the wing down in back. To measure the angles a dial gauge angle finder would work or a digital protractor, depends on how much you want to spend.
To get it to follow the curve of the roof (left to right) rather than going to the trouble of heating it and trying to get the curve just right, maybe a third support in the center of the roof line. Though that means more holes in the roof.
Keep up the good work. A mpg here and one there soon add up!
Just my three cents.
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