Update...I took my unloaded truck with a full tank of fuel to the CAT scale on Saturday after subtracting it's weight from the 10,000 GVWR it was 97lbs down on payload capacity which sounds right to me not including me the driver.
I had added the the side steps and the BAK Revolver roll up aluminum tonneau cover after I bought the truck which weighs around 100lbs combined. So the listed payload on the sticker seems really close to me.
2015 Ram 2500 CTD,CC,SB,4x4
2016 Rockwood 2703 Emerald Edition
Husky CenterLine TS Hitch
TST 507 TPMS
Progressive Industries EMS-PT30C