The Morris Commercial C8 FAT (Field Artillery Tractor) commonly known as a Quad was an artillery tractor of the British and Commonwealth forces during World War II. It was used to tow field artillery pieces, such as the 25 pounder gun-howitzer, and anti-tank guns, such as the 17 pounder.All Mk Is and approximately the first 3,000 Mk IIs had a "beetle back" body.