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I can not address the lowering of your truck. I had to play with the height adjustment on the hitch in the truck bed. I was able to raise and lower it in the bed by using different bolt holes. You still may not be able to get the bed clearance by doing this.
The other problem I had was the lower back bottom of the pin box would hit the bed rails in a sharp turn on my 08 Chevy 3500. I bent my bed rail and had to buy a new rail cap. I ended up nipping the lower corner of the pin box by about 1". This solved that problem for me. I mention this as something for you to look for when making a sharp turn.
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