The largest car in Mercedes-Benz' lineup is getting even bigger with the all-new 2020 GLS. The full-size SUV gets a 2.4-inch longer wheelbase that allows for bucket seats in the second row. Backseat passengers also get a tablet to themselves for controlling entertainment and comfort functions, and two large touchscreens are there for the driver and front seat passenger. New V8 and straight-six engines come with Mercedes' new 48-volt electric assist for more horsepower and torque when needed, improving power and mileage over the previous model. The new GLS will arrive in the US towards the end of 2019.