OK, so the fully loaded, weight-wise (Laramie, 4x4, Rambox) 2014 model has a capacity that low. But that's a far cry from "most trims of RAM can only do 900 lbs total payload". Looking through your chart and the rest of the variations at the source web page for that chart (
http://www.rambodybuilder.com/2014/docs/ram/rammlup1500.pdf) shows that most are 1200# or more. For instance, a Sport model similar to my 2010 (Sport, 4x4, 5'7" plain box, Hemi) has a capacity of 1420#. Not sure what else they dump into a Laramie Limited since my Sport was pretty much fully loaded except for rear seat DVD and a rear seat heater so I'm going to say the sub-1000# capacity is a fringe case. Just call it out as such, is all I ask for the original poster that complained about it. Misguiding blanket statements are how we get bad info on the web that someone else will find in a Google search someday and take as fact.