Army trucks are measured by how many tons (907 kg) each cargo model can carry. The same type of truck can have different bodies. They also measure the number of wheels that are connected to the drive. Off-road trucks have all-wheel drive. Trucks with two axles are called 4x4, trucks with three axles are 6x6, and trucks with four axles are 8x8. Dual tires are counted as one wheel.