well not exactly what you're asking for but pretty similar!
I have a 2020 Silverado 3500 Duramax SRW Standard Bed and I'm hauling a 42' 5th Wheel, when all loaded up the trailer is about 19-20k lbs. It's a toy hauler so that keeps my pin weight down to safe levels for the SRW. When loaded with toys in the garage which is almost always, a SXS, my pin weight is about 2600-2700 lbs.
I just finished a long trip, left Oregon in December and went to Idaho, Utah, Arizona, Nevada, and California. It handled everything like a champ! The Duramax definitely had no power issues.
Oh, I'm also not using the standard 5th wheel kingpin and hitch in the bed. I installed a Gen-Y Gooseneck conversion hitch and I absolutely love it. also frees up the bed of the truck and I never have to worry about removing the hitch to get my bed back.