firepoggy, have you considered getting the mopar 5th wheel prep kit added to your truck? Should be about 250 bucks. It's part number
82213665AB. This should allow you to keep your B&W gooseneck. Then you can buy a
reese picture frame adapter for about $370 dollars to stack on the mopar 5th wheel prep package and allow you to use your reese pro series hitch you already own. So for about $620 dollars, you can use your conventional 5th wheel and the reese revolution hitch the way it was meant to be used. Cheaper than a sliding setup and you still get a flat bed when you don't need the 5th wheel.
Just one way to work with what you already have.