 H-drive is probably best known today through the Alvis FV600 chassis, the Alvis Saladin armoured car, the Stalwart and family.The initial requirement was developed by the Department of Tank Design (DTD) immediately post-war and the six-wheel, all-driven configuration with all-round independent suspension chosen on the basis of experience with the best of WWII vehicles from four to eight wheels.The Saladin was designed as a 10-ton vehicle built on a welded steel punt chassis, forming an armoured monocoque hull.