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Jaron, having built a shell and having given it a ton of thought, I believe you should not do what you've done, I initially thought I'd do what you did, but instead put my cap to the tail gate. Even this I believe is too steep. You should only come down to only about 10 inches above the top of the bed on top above the tailgate. This will give you a shape which closely approximates the ideal aero shape which streamlines the airflow without creating a lift drag which you are doing now in a huge way if you are not in fact separating the flow. Also, you cant have an abrupt edge like you do, it needs to be radiused in order for the air on the sides to transition smoothly.
Congrats on building something though! You're way ahead of most people on this.
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