Henry Payne reviews the 2020 GMC Sierra AT4

The 2020 GMC Sierra AT4 is a tool with many skills including towing, moving boats and bicycles, and going off-road.

The big grille of the 2020 GMC Sierra AT4.

Sculpted beast. The 2020 GMC Sierra AT4 is considered one of the best-looking trucks around.

The 2020 GMC Sierra AT4 comes with Multipro tailgate and corner steps for bed access.

The 2020 GMC Sierra AT4 comes with Multipro tailgate and corner steps for bed access.

Have bed, will travel. The 2020 GMC Sierra AT4 came in handy when Detroit News auto critic Henry Payne needed to transport canoes in East Jordan, Michigan.

The 2020 GMC Sierra AT4 fits six bicycles in its bed.

The 6-way Multipro tailgate on the 2020 GMC Sierra AT4 can do everything but that — it can't be used as a dump truck.

Oil burner. The 3.0-liter diesel engine in the 2020 GMC Sierra AT4 can get up to 26 mpg.

The interior of the 2020 GMC Sierra AT4 is comfortable and ergonomically useful — but it lags competitors like the Ram 1500.

The 2020 GMC Sierra AT4 features lots of storage like twin gloveboxes.

The quarter dash panel in the 2020 GMC Sierra AT4 puts useful features at the driver's fingertips.

The 2020 GMC Sierra AT4 rear cameras are essential for backing up — and towing.

The 2020 GMC Sierra AT4 features hidden storage for clothes or a laptop behind the rear seats.

The 2020 GMC Sierra AT4 Crew Cab has lots of room in the second row. But when traveling with four people, best to get a tonneau bed cover so you throw luggage in the box.

More storage? The 2020 GMC Sierra AT4 has it under the rear seats.

Backseat passengers get their own amenities in the 2020 GMC Sierra AT4.

With an extra two inches of lift and 32-inch tires, the 2020 GMC Sierra AT4 is set to roam off-road if desired.