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For me the interesting take-away from that study is that, with regard to the cabin top, a long exit angle and a short entry angle, with a strong bias for location of maximum thickness at about 30% aft of the front of the cabin top approximately mirrors the configuration of conventional airfoils.
As a guess, their model would show improvements, if instead of the simple prismatic shape, they tried a smoothed foil of about the same proportions with thickness at about 30% of chord.
I think, the incidence probably would be critical to shaping the flow over the tailgate in a real truck, and that would probably vary for different trucks, with the heights of the cabin-top, and the tailgate, and the distance between them.
Also, of course if there was a partial or full tonneau.
Lots of variables, no definite statements... this is the postulation part. No certainties.
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