I appreciate all the input.
I installed a Pac-Brake on my previous 3500 QuadCab. I would never be without one; it will be my first modification.
I also agree that 4X4 is a "must have" if getting an auto. I saw an auto 2wd have to back out of a parking area over the weekend because it couldn't untrack the load going up hill. A low range would have solved this.
Another reason I'm considering an auto this time around is that I'm not a huge fan of the new G56. If the old NV5600 was still offerred, I wouldn't even consider an auto, but I'm hearing of some reliability issues.
That said, even though I tow large heavy loads, I've always had good luck with all my vehicles. I must be pretty easy on them. Conversely, I know some guys that can tear up an anvil with a rubber hammer... .