I put 2020 GMC Sierra wheels on my 2016 Sierra.

[737mechanic]

I didn't care for the wheels that came on my 2016 Sierra and I happen to find a guy on craigslist that had bought a 2020 Sierra and had the dealer install a 6 in lift and new set of wheels, his wheels and tires had never left the dealer lot so I bought them and installed them on my 2016 Sierra. Not only did I get a nice set of wheels but I also wanted 33" tires and that is what comes on the 4X4 Sierra. 

 

The only thing I had to do was install a new set of TPMS sensors because GM switched to the 433MHz sensors in 2019.

[acinquegrana]

Same here. 275 65 20 duratracs with 2.25 level and add-a-leafs. No rubbing.

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[Nick Pregoni]

I'm looking to maybe do the same on my 16 Sierra. any idea if the new Denali or at4 wheels will fit without trimming or leveling?

[737mechanic]

You need to find out how tall the tires are on the Denali Compared to yours and that will tell you if they will fit without rubbing.

 

I forgot to mention I did 

[GOMD]

I was able to fit 20" wheels and tires from a 2019 LTZ, (275/60/20), or 33's,  onto my stock 2017.

 

No level, no lift, and no rubbing.

 

From the GMC website, the Denali 20's and all factory AT4 wheels/tires are the same size or smaller than these. So they should fit.