The German Panzerwerfer is a half-tracked multiple rocket launcher based off if the SdKfz 4 employed by Nazi Germany during the Second World War.
About this creation
The Panzerwerfer 42 auf Maultier weighed 7.1 tonnes, was six meters long, two meters wide, and nearly three meters high. It was capable of reaching speeds of up to 40 km/h. One of these half tracked vehicles generally carried a Nebelwerfer 42 launching system, which was specially designed to be mounted on the Opel-engine powered Panzerwerfer
The German engineers designed this system because of the conspicuous trails of smoke left behind by the Nebelwerfer batteries, which necessitated a self-propelled artillery piece.
The system contained 10 missile tubes, and generally carried 20 projectiles, enough for the vehicle to fire two full salvos.
It was considered less accurate than a dedicated artillery piece, but its ability to saturate an area with fire and strike terror into enemy infantry helped it reach widespread use during the war. It was known as the "Moaning Minnie" by Allied soldiers for the distinctive noise the rockets made when fired, similar to the Nebelwerfer stationary artillery.
I have no idea how people get into the cab, as none of the pictures of this thing have shown a door. The only possible way to enter that I've seen is through the hatches.