Hey Christ, Thanks for that heads up.
I was considering putting in a clear area on my build but you just save me a ton of time and I'm sure aggravation trying to get a "View Port" in there right.
Strange, IMHO, you can't make it too steep if you go from the back of your cab roof down to your tailgate top. You do want to be sure to make it a curve shape. Your aero cap will have a flat area on top just behind the cab and will have it's steepest slope just in back above the tail gate. Air flow hates
any sudden changes here.