Oshkosh Corporation in the context of Pierce Manufacturing

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. Unlike four-wheel drive drivetrains, the configuration is largely confined to heavy-duty off-road and military vehicles, such as all-terrain vehicles, armored vehicles, and prime movers.

When such a vehicle only has six wheels by definition all are driven. 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. For most military applications where traction and mobility are considered more important than payload capability, single wheels on each axle (often referred to as super singles) are the norm.

The Logistic Vehicle System Replacement (LVSR) is a family of heavy-duty military logistics vehicles of the United States Marine Corps (USMC) based on a common 5-axle ten-wheel drive (10x10) chassis. The vehicles vary in individual configuration by mission requirements, with three variants in service: a cargo, a wrecker and a tractor truck. The LVSR was designed and is manufactured by Oshkosh Defense.

The first LVSRs were ordered in 2006. The LVSR is the USMC's equivalent of the U.S. Army’s Heavy Expanded Mobility Tactical Truck (HEMTT) and Palletized Load System (PLS). The Marines do not use the HEMTT or PLS and the Army does not use the LVSR, but both services use a common trailer (M1076) with all three truck types.