bumper pull vs. 5th wheel
I'm looking at a sales brochure for a 2001 Silverado, and it has all this data posted.
I'll just give you a sample.
A 2500HD with duramax deisel lists maximum trailer weight of 12,000 pounds for any configuration using a ball hitch. The corresponding numbers for a fifth wheel are 15,200 to 15,800, depending on the truch setup. See your local Chevy dealer for a more detailed copy. GMC also has the data, but they show their number in Gross Combined Vehicle Weight (GCVW), which can confuse the issue a little until you remember they are the same truck with a different nameplate.
Having listed MAXIMUM trailer weight, allow a 10 - 15 % margin for safety. And judge your trailers by their listed gross capacity, since you must account for all your passengers, your "stuff" in the trailer, and any liquids you are carrying.