2023 GMC Denali Ultimate trailering in the Rockies with baby Duramax 3.0L inline 6 cylinder. We tow 8000 lb trailer, almost max trailer of 8800lbs. Torque monster diesel has instant power towing at altitude. Turbo spools up fast, 10-speed automatic transmissions delivers the power to a 3.23 rear axle ration. Such a quiet diesel, empty truck rated for 27 mpg on the highway. This could well be my next truck, in a work truck version. Denali Ultimate is back in the luxury truck segment. GM still the king of trailering cameras. Glossy grill is improvement. #MrTruckIzzyReview #trailering https://mrtruck.com/