Just ran across the numbers for the 1999's
My wife and I were just cleaning the house and found the data sheets I used to pick my truck.
The 2500 auto with 3. 54 gears is 16,000 GCWR and 9,900# trailer.
Personaly I am just over that. Exh brake and EGR and probably Boming here I come... ;-)
4. 10 was 18,000.
Ira