The use of multiple rocket launchers by the German Armed Forces during World War II was quite extensive due to low cost & 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.