Thats the way they are and designed. I had a 2015 Denali XL and a 2017 Denali XL. The '15 was a dump truck, the '17 was better but just NOT a nice ride. Dealer explained to me they were designed that way to lower their rollover rate. Well I can agree that it was fast as hell and handled turns well at higher speed. But the ride sucked. I had more problems with this new generation truck than any other GM vehicle I ever owned. (which is many!) Between the horrible seats, and the crappy ride after 3 years of warranting a host of other issues I gave up. As you can see from some other posts, it's a common complaint. I loved alot about the truck and was pretty close to changing out the suspension after tons of research when I got a grip on myself and reminded myself how much I paid for that truck...2 times!! I traded on an S550 and bought a 2013 LTZ suburban as our second vehicle which has worked out good for me. The prior generation just had a better ride and seats. Wish it had the 6.2 and a 10 speed though!!! LOL
It amazing once the new car smell and happy first impressions fade...those same issues pop up for many guys. For me at that price point it just wasn't a refined vehicle.
I will say this. I considered every SUV out there at that point. Came close to the GLS550. Nothing really compares to an Escalade or Denali as far as speed, fuel mileage, presence, capability, towing, cost of maintenance. It was really so unfortunate they didn't fine tune this truck for comfort and luxury as they should have. Everyone of my friends commented on how "tight" and rough my trucks rode.....and I live in Florida with excellent roads!! At this price point it became very unacceptable. If you love the truck otherwise you can dump some money into it but expect to lose every penny of it when you trade out of it. Thats what made my decision to cut and run. Good luck