[wingnut60]

Sounds like you know more about setting up to tow than a lot of people...

A quick look at the GM '16 2500 Duramax site says you can tow up to 15800 by fifth wheel--that is a lot of weight.
The problem is, that same truck has a payload of 2872lbs (again, quick look at GM data);
a 15800 GVWR trailer can have a pin weight as high as 31-3200lbs, maybe even higher.
If you take that 3200 pin weight and compare it to the payload of 2872...see what I am getting at?
That same trailer, towed at around 13000, will have a pin weight around 26-2800lbs--maxing out the payload without anything in the truck for extended camping period.

It is done all the time, and a 2500HD is a great towing vehicle, but you will be close to being over on some weight numbers.

I would not hesitate use one to tow at around 12500-13000, but would be real careful about how much stuff I put in the truck and trailer, and be extra careful not to ever go over the carrying capacity of the rear tires, which should be about 7500lbs.

Good luck in the search, its a lot of fun to look at new units and figure out just the right one...

Joe