OK from what I see you had the perfect opportunity to build any kind a hitch you wanted. That hitch there is not the hitch you want.
Now I'm not saying my design is better then anyone else's. but I know it plants the ass of my truck better then my old hitch.
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You should have mounted your main pivot point on top of that square tubing you have mounted on the truck. Then for your receiver part of the hitch I'd had that at your 30 Dreg. angle you mentioned or what your rules read. My adjuster heads down to the rear end housing but I have seen them go to the rear of the frame up like you have there.
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My suggestion is to rework the hitch before you have it sand blasted, it will look better in the long run.
Dan