While the 2017 models might have slightly higher payload, the real killer of payload is the diesel engine.
My 2016 F250 CC SB with the 6.2 liter gas has a listed payload of 3100, with a 10000 lbs GVWR.
I have the camper package with the factory overload springs.
The truck came with a glove box sheet of paper that says certified for a truck camper with a weight of 1790 lbs. That's assuming 6 seating positions filled by a 150 lbs person.
Could I carry a Lance 855S? Probably, but it would be really close.
I think a lance 825 is perfect for that truck, and that's kind of what I'm currently shopping for. Slides are just too dang heavy. That being said, the rear axle is rated for 6200 lbs, and the tires combined for 6900 lbs (load range E).
Go figure...