I actually did the 2" drop shackle first. Here it is with 26's and a 2" rear drop. And my current wheels with a 2" rear drop. I don't have a picture with factory wheels.
Both setups looked horrible IMO. The 26s didn't rub too bad, but my current wheels would rub pretty bad up front. I took the shackles off within 2 days. You can have them for $20 if you want them.
I've got about 4,000 miles on my 2016 Sierra Denali with the Suspension Maxx level kit. Zero issues. It's on 20x9 with zero offset and 295/55/20 Toyo M/Ts. Also (in the last pic) I took the snow plow air dam off the front. Looks 10x better without it. IMO