Yes, mother.
We know the stock components are good to at least 1900 lbs payload because some versions--basic standard cab, 8-ft box, Pentastar--have that rating. Of course, the problem is taking a high-end model with 900 lbs of options and a 1000-lb payload and trying to add another 1000 lbs to that. In my case the factory air suspension starts to complain at about 600 lbs over rated payload in a static condition, and it quits completely at about 850 lbs over. I can't say what driving long-term at, say, 500 lbs over would do to other components. We will not know the actual limit until someone tries it and breaks something.
I think the standard coil suspension is more open to upgrades and could be fitted to carry 1000 lbs over-capacity without too much sweat. I'm sure some people are already doing mods such as LT tires, airbags, better shocks, beefier sway bars, etc.