I have a 2016 diesel and tow a 23 foot wakeboard boat with it. Total weight is in the 6,000 -7,000 pound range depending on fuel and other stuff in the boat. I tows much better then the Denali with a 6.2 liter V8 that this replaced. I was getting around 9mph with the Denali and got 17mph on a 2,000 mile plus trip this last summer towing the boat. (That mileage was per the trip computer which some claim isn't that accurate.) I couldn't be happier with it. Much smoother and quieter than the Denali also with no notice decrease in power.
Kris
Kris