The use of multiple rocket launchers by the German Armed Forces during World War II was quite extensive due to low cost and high efficiency of these arms systems. The main inconvenience of these vehicles was scarce mobility which made them vulnerable to enemy counter attacks. Thus, this mobile version of a 150 mm rocket-launcher type 42 was mounted on a half-truck Sd. Kfz. 4 Maultier, which guaranteed high mobility in off-road conditions. The vehicle was equipped with armour to protect its crew.