Look Here
There's a ton of info, so it's worth saving a copy. Base curb is 3203#. Curb is full fuel & fluids, no cargo or passengers.
The option weights are listed too, and the maximum option weights to keep it within it's certification class I guess.
Edit: interesting. I never really paid attention to option weights. If you look it shows what the option adds to the front axle/ total truck. For instance, if you look at an auto vs. a manual, the auto option adds 40# with 32# of that held by the front axle. A 4.0 weighs 72# more than a 3.0 with 49# over the front axle--leading me to believe that that total takes the rear-end being an 8.8 instead of a 7.5 into account.
A 3.0 weighs 137# more than a 2.3. Now I see why people say the 2.3 is faster--it's about the same power, but you are carrying the weight of another passenger when you have the 3.0.