As a now former owner of a 204,000 mile 2011 Yukon Denali XL All Wheel Drive with the factory 4 wheel MagneRides with the Auto adjust rear air, I am amazed that you want to change them out. That set up, coupled with an upgraded Helwig front sway bar and an added Helwig rear sway bar, is "bar" none, the best suspension I have EVER had under a passenger car. I tow nothing. It was a pure road car. It was as stable at 95 as it was at 65. It made no difference if there were 6 adults in it, or just 2, which was the usual. It was dead straight down the road. No erasing. My Bridgestones typically ran 60,000 miles before I got tired of looking at them.
I just replaced it with a 2023 Yukon Denali XL Four Wheel Drive, same set up EXCEPT, it has Air Ride instead of springs. We have had it on the road. Every bit as good as the 2011, except quieter. Same Bridgestones from the factory as I have been running on the 2011. Very controlled ride.
Good luck with the changes. You will not like them. Guaranteed.