I tow a 33' 5th wheel with my 2015 (for towing purposes, 2015 and 2017 would be identical). It is pretty light for its size, per the factory it is just under 9k dry. Loaded up I am between 10k and 12k (12K if I am double towing my RZR, which does not add pin weight)
I've weighed my load, I don't remember the exact numbers but I know I "officially" exceed my payload by 100-200 pounds, but I am well within my axle weight ratings. It does just fine. It doesn't squat much and handles it just fine.
The payload plays into the GVWR and to be considered a "Class 2" truck (2500/3/4 ton), it has to have a max GVWR 10,000 lbs. The payload is the difference between truck's curb weight and 10k. As many have said on this and other forums, 2500's are artificially limited to meet the Class 2 classification. So, if you stay within your axle limits, you're good.
That said, you wouldn't want to go much heavier than mine is....because I am on the cusp.