bmack, be sure you heed what I mention and illustrate in post #10 of this thread. You don't want to drop down too much in the back, particularly if you do not shape and radius the side to roof edge. You'll get more usable space underneath, have the possibility of a peek window, and it will perform significantly better mpg wise if you keep it at about an 8° angle. Let me know what your truck is or post a pic and I'd be happy to illustrate it for ya. Sounds like your going to do a fairly good job on this.
Charlie
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