Based on a Laffly S-15 six wheel drive all terrain design, the W-15T (T - "Tracteur") was a low profile version of the S-15T. It was originally built by Hotchkiss and designed to tow the 75mm Mle 1897 gun and the Canon de 105 court mle 1935 B howitzer. The W-15T was powered by a 4 cylinder petrol 2300cc engine capable of 55hp and a maximum speed of 72kph. Captured vehicles in German service were used to tow the 3.7cm Pak36 anti tank gun with some armoured and converted to APCs.