The 2008 Mercedes-Benz R-Class is a large luxury crossover wagon with seating for six or seven passengers. Standard equipment on the R350 includes 18-inch wheels, leatherette premium vinyl upholstery, Mercedes COMAND driver interface, birds eye maple accents, a power driver seat, dual-zone automatic climate control and a single-CD stereo with eight speakers and a glovebox-mounted auxiliary audio jack. Most desirable options are rolled into pricey packages, although a handful can be selected la carte. Among the more notable add-ons are the new seventh seat, leather upholstery, burl walnut trim, an excellent 12-speaker Harman Kardon surround-sound audio system, satellite radio, park-assist sensors and a navigation system with a rearview camera. Other available accoutrements include a panoramic glass sunroof, 19- or 20-inch wheels, Bluetooth, keyless ignition, heated seats and steering wheel, a power rear liftgate, three-zone climate control, adaptive cruise control, and glovebox-mounted six-CD changer and dedicated iPod interface. All R-Class models are outfitted with stability control with a rollover sensor, antilock disc brakes with brake assist, active front head restraints, side-impact airbags for front and second-row passengers, and side curtain airbags for all three rows.