Payload for 2016 Ram 2500?? What am I missing??

We have a 2015 Ram dually 2 x 4 Laramie with the Aisan transmission, 4:10 rear end, puck system, and B&W hitch. It is a towing machine and since we are full timers (8 years) we like the ride of a big pick up and the inside is very nicely appointed. Only disadvantage with a dually is parking in parking lots/garages. Did I mention that it is a towing machine? Understand that a dually is not the best option for everyone and that any of the big three manufacturers have great trucks.