Due to the lack of any kind of aiming devices the recoilless rifle was never designed to be fired from the scooter […] However, in an emergency it could be fired while in the frame, and while the scooter was moving.

[…]

The scooter [sic] themselves were original civilian produced VB1T models, 150 cc capacity engine. The engine was two stroke, top speed of 60 km/h (37 mph).

This is so incredibly Dudes Rock.