Rather than 'ideal' I'd say in the ball park. Here's the patent GMC took out
Quote:
https://patents.google.com › patent › US4573730A › en
An aerodynamic drag reducing device for a pickup truck includes a tonneau cover which extends between the side walls of the pickup box and forwardly from the tailgate to a distance short of the passenger cab so that the tonneau cover encloses a rearward portion of the pickup box. Tonneau covers enclosing the rearward portion of the pickup box to a range of approximately 40 to 60% of the total ...
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Use the search term 'pickup truck wing' and look at the first three articles.
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