The Mercedes-Benz GLS is an immense, ultra-luxurious SUV earmarked to compete with the Audi Q7 and the Porsche Cayenne. It can accommodate seven passengers in utter comfort and has a nine-speed automatic transmission for 2017. The GLS' air suspension transforms the road into a long tranquil river and you can choose between a V6, a twin-turbo V8 or a diesel. For those who can never have enough horsepower, there's also an AMG GLS 63 variant.