Thanks for the positive comments everyone. I have had several sets of these Toyo M/ts on other trucks/yukons and they are really good tires....but you are spot on about keeping them rotated. They do sit really square on these wheels, which will help prevent the cupping issues that plagues some of these mud terrains.
The leveling kit is a custom kit put together by a friend of mine that owns Down East Offroad in Wilson, NC downeastoffroad.com
I'm not sure if he sells them for self installs or not. Probably would I guess.
So far, I have been in to the dealer and shown them what I did. I have bought my last 4 or so personal vehicles from them and all those had a mild lift and larger tires on them within 1000 miles of being new. Never had a warranty issue with them.
Actually just had to go in today to get scheduled for some warranty work. The stitching on the passenger headrest "Denali" the "i" is about unraveled. Also, the headliner around the dvd players and also the sunglass holder is fraying apart. Something I would not have expected from a vehicle with this price tag. So, looks like a new headrest is on order and a headliner replacement or repair.
Got about 1600 miles on the yukon now and everything has been working pretty well otherwise. Tires get a lot of looks.....most think it is crazy that I did it on a brand new Denali. I use the rig for family trips and also to go down to my hunt camp and hauling stuff around town, so it works for me and makes it not look so much like a soccer mom or grandma vehicle.....so I like it!