From my 2015 Ram sales catalog:
A 2500 Crew Cab 4x4, 6'4" box, with an 8510 GVWR (which is the Power Wagon GVWR only) gives a payload of 1,480 pounds.
The same truck but not a power wagon has a GVWR of 10,000 for a payload of 3,280-- 1,800 more than the PW.