I have a 2011 Silverado dually with a Highway Products bed.
I had them install the steel plate and hatch so that I have a gooseneck ball and a Reese 30K fifth wheel hitch.
The Reese weighs 65 lbs and requires pulling two pins to lift it out. Then the goose neck ball is exposed.
The Hatch didn't quite work out, so Highway Products has shipped me a set that open 90 degrees from these, so they lay flat when using the hitch.
I have air bags, and it takes 45 psi to level the truck after hitching the Voltage 3800.
Here's a pic: