Correct. The 2500's (like most manufacturer's 3/4 ton trucks) are artificially capped at a 10,000 GVWR. No difference in Florida, but, some places have thresholds for insurance and registrations changes for vehicles over 10k, so, manufacturers have historically capped 3/4 tons there and let the 1-tons do the more commercial type work/insurance/registrations. The truck is likely capable of more, but, legally, the sticker says 10k max. It bugs me how these things are done. You're penalized for a diesel sitting over the front axle when in all reality, that has very little impact on the true payload where it's placed in a truck. Everyone will view the numbers differently, that's just my opinion. I am not convinced that a 2500 gasser with 3000# sticker payload is any more safe/stable than a 2500 CTD with 2000# sticker payload when towing a 2200# pin weight fiver for instance. One is definitely overloaded by the book, the other may not be, but, the rear springs see the same exact thing.
Thanks for confirming my suspicions that the numbers are artificially lowered because marketing i guess. When i was looking to trade in my Ecodiesel because of the Engine fire recall, and I did need to go to a bigger truck for TT, it was the right time to make a move, with 0% APR. Unfortunately here in North NJ at the time there were no 3500's available anywhere, and I found a pretty good deal on my 2500. I spoke to a buddy of mine who's grown up driving & working on HD trucks, and currently has a 2001 F250 7.3, i asked him about if i should hold out for a 3500, and he said for how little i tow (4 - 5 times a year) don't bother with a 3500. He told me the 2500 will ride nicer for most of the daily driving i do, and under the sheet metal except for the springs, all the important stuff is identical between the 2500 & 3500 so if I ever have to do any heavy towing the 2500 will be up to the task no problem, it might just sag a bit in the back.