They have rail type hitches and puck style hitches now, not sure if one of those would fit your current rail or puck configuration though. You could call them and see, nice guys at B&W and very helpful over the phone.
If not one of the abouve types, you could opt to get the B&W turn-over ball hitch(Goose-neck hitch) installed under the truck bed (with 4" drilled hole in the bed),
AND the 20k B&W Companion 5th wheel
That way you could haul a goose-neck trailer if ever needed, too.