Mercedes launches limited six-wheeler toy for Sheiks to groove in the dunes.There are only so many possible permutations of a metal box on fourwheels designed to go fast over any terrain, and from the Jeep Wranglerto the Range Rover, all of them have been explored in some degree withvarying levels of ability and luxury. It was only a matter of timebefore a group of mad engineers gathered together and said "Screw it,let's go six-wheel-drive."Those engineers work forMercedes-Benz, and this creation, the G63 AMG 6x6, isn't a concept, but aluxury SUV that the German automaker will build for a handful ofwealthy customers.Six-wheel-drive trucks have been in military and commercial use fordecades;Mercedes made a few for use before World War II, and itscommercial division has supplied a 6x6 version of the old Gelandewagen (ATV)to Austrian forces since 2011.But that truck features a baremetal cabin and power from a 185-hp diesel. The AMG engineers swappedthe drivetrain from the G63 AMG, featuring a 5.5-liter, twin-turbo V-8good for 536 hp, mated to a seven-speed transmission, good enough tohustle the 8,300-lb. juggernaut to 60 mph in about six seconds. Inside,there's room for four passengers to ride in a tableau of luxury, fromthe quilted white leather seats and carbon-fiber accented dash to thebamboo-lined cargo area.As for the six wheels, they're not justfor show. AMG splits the torque 30/40/30 among the axles from front torear for maximum traction, with locking differentials for all 37-inchwheels; the 6x6 can ford water more than three feet deep and its52-degree approach angle means it will climb most anything short of asheer cliff face. For desert travels, the tires can be inflated anddeflated from a panel in the cabin.