Six-wheel drive

Six-wheel drive (6WD or 6×6) is an all-wheel drive drivetrain configuration of three axles with at least two wheels on each axle capable of being driven simultaneously by the vehicle's engine.

When it has ten – with two pairs of ganged "dual" wheels on each rear axle as on a GMC CCKW – all are also driven but the 6×6 designation remains.

Heavy hauler and ballast tractor 6×6s have had a long history as prime movers both in the military (as tank transports and artillery tractors), and commercially in logging and heavy equipment hauling both on- and off-road.

Depending on the vehicle's role, the number of wheels varies between six (in three pairs) and ten (with two in the front and two dual axles with four wheels apiece in the rear).

Military Military/commercial Commercial Conversions Recreational ATV/UTV Concept car, testbed, and limited production commercial examples include: Twin front axle Twin rear axle (Twin axle) drive in the rear, and an integrated "roll steer" function built into the suspension design.