OP here. Got the truck and I love it. A little tall and I got to get running boards for the wife.
But the deal was that I bought new a 2013 Sierra 1500 for 28K (all kinds of rebates and deals when they closed that model run for the big reboot on 2014), and they offered me 24.5K 3 years later in trade. I owed about 8K on, and that made for a 16.5 downstroke. It would have been insane not to buy the thing. Heck, my monthly payment is just a little more and I got a truck that won;t be flinching when the trailer is hooked on. Only one snag: I had to get a new hitch shank cuz this one is 4 inches higher at the receiver.