Breathtakingly expensive, hugely powerful, and anachronistic in looks, the G63 rental Miami and G65 are not for the introverted. With roots going back to 1979, it retains its basic fashionista-meets-Sandinista look. In the G63, a twin-turbo 5.5-liter V-8 makes 563 hp and mates to a seven-speed automatic; all-wheel drive is standard. The G65 gets a twin-turbo 6.0-liter V-12 that makes 621 hp and moves the three-ton SUV to 60 mph in just 5.1 seconds. An all-new G-class goes on sale soon as a 2019 model.