The Fiat SPA As.37 Auroprotetto ('self-protected') was developed in 1941 on the chassis of the light artillery tractor Fiat SPA-TL37 deployed in Libya and renowned for its excellent cross-country capabilities. Compartimentation was straithforward, with the front Fiat engine, followed by the driver compartment (with the commander seating alongside), and behind, not separated, the small open top troop compartment. The construction called for sloped bolted plates to a frame fixed over the original 4x4 wheel drive and steering chassis. This armour only protected from shrapnells and small arms fire. The troop compartment was large enough for height men seating on side benches, and access was performed through a rear two-piece door.