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I hope I haven't offended
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Well, I'm offended by that. Man up! It's only words.
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Corection the hitch is 38"w 2.75×2.75 sq. It hangs 13"lower than the lowest sheet metal and 17below the bottom of the bed over a foot off the ground.
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This is your main constraint. All the air below the vehicle has to be herded through that opening. An at least partial bellypan, of course. I suggest a difusser made by fences that start inside the rear tires and curve outward to 38". Like this only with more ground clearance.
The only reasonable angle for the tailgate is 0°, so as to not compromise load/unload (it's in the middle of the wake anyway). There is a 17x38" space below that could have some structure added or unfolded.