I had a 2011 Yukon Denali XL that I believe came with the air suspension. I used it to tow my 7000 pound surf boat. The air suspension was nice as the back end would really sag without it. That said, when it stopped working at about 100,000 miles, it was the proverbial straw that broke the camels back for that vehicle, at least in my wife's eyes.
I was strongly considering replacing my 2011 with another 2016/2017 Denali. That is, until I started shopping. What I found was that I could get brand new 2019 Ford Expedition Max for about the same price as a used GM full size SUV.
I've never been a fan of Ford, so it wasn't an easy sell for me. But I couldn't get over the price difference of a new Ford vs a used GM. I've only had the Ex for about a month, finally got over 1000 miles on it, and did a short tow with my boat. All I can say is that I am impressed. I didn't really get a chance to work the engine to compare it to the 6.2 in my Denali, but I REALLY like the 10 speed transmission, and it seems significantly more stable as a tow vehicle than my GM.
It is definitely something worth checking out.
2012 RAM 3500 Laramie Longhorn DRW CC 4x4 Max Tow, Cummins HO, 60 gallon RDS aux fuel tank, Reese 18k Elite hitch
2003 Dodge Ram 3500 QC SB 4x4 Cummins HO NV5600 with Smarty JR, Jacobs EB (sold)
2002 Gulf Stream Sea Hawk 29FRB with Honda EV6010