The long-wheelbase variant of Chevrolet’s full-size SUV is completely new for the 2021 model year. It now offers way more interior space particularly when it comes to the third row. Meanwhile, ride and handling both benefit from a new available air suspension with magnetic dampers. The 5.3-litre and 6.2-litre gasoline V8 engines return, but there’s a new option for 2021: a 3.0-litre six-cylinder turbo-diesel that generates 277 horsepower and 460 pound-feet of torque.