The tailgate was up.
I would have to guess b since I could see where the air was pushing it down as I was speeding up.
Yer aerocap design looks good. I guess yer approach is similar to a tonneau that caps over the sides...except the sides are extended up from the bed rails.
During some brain storming...I was thinking about the same design but taking an actual tonneau and testing it out with the raised sides. I guess it would be pretty simple to build up a rounded shape on top of the tonneau then...
I guess that would be one way to approach current tonneau owners. Make a kit that made use of their tonneau to make it more aerodynamic. As I think about it...it wouldn't work because the width of the cab is smaller than the width of the bed.
