Not enough information to answer your question. Ideally you want a level 5ver with 6"+ of clearance between the bed rails and the overhang. You can begin by measuring the distance between the king pin plate and the overhang. So you want overhang to be 6" above the bed rails. Now you can determine where the king pin has to be in the truck. You have variables. Like your Bed Rail height from the bed. The sag of your truck with the pin weight. You are going to have to do some figuring. You need to do a test setup and see where you are.
'14 RAM Longhorn,DRW,4x4,CC, LB, 4.10, Aisin, 70gal underbed fuel tank.
Lifestyle 36FW, 8000lb axles, disk brakes, 19,100lbs
Andersen AL Ultimate hitch