Rides great thats the first thing I checked. Plenty of excursion. The shocks combined with the new arms maybe give me a better ride than I had stock. With some slight fender trimming I think 37s might fit but I’m sure any increment just under 37s would work no problem as long as you stay with 12.50 and no wider. I think 22x10 wheels and 37X12.5Xr22 would look great.Here is the lift link.
https://www.roughcountry.com/gm-suspension-lift-kit-95830.html?find=2020-gmc-sierra-2500-hd-4wd-477111