It’s been less than a year since we first saw a production version of the Mercedes-Benz R-Class, but already the company is showcasing the vehicle’s possibilities. Case in point is the Vision R63 AMG, which Mercedes calls a prototype, albeit one that’s close to production standards. Power comes from the same AMG-built, 510-horsepower, 6.3-liter V8 found in the new ML 63 AMG, managed by an AMG automatic transmission with steering wheel controls and delivered through a permanent all-wheel-drive system. Inside the wheel wells are 21-inch alloys wearing P265/40R21 tires.