I have a restored 1965 404 gas Unimog with a radio box camper. It has a swing fire (schwingfeuer) gas heater, above the cab that I am modifying for the spring camping season. The heater has not be used by me or in several years. Not sure how it operates on the vehicle although I have viewed the several youtube videos of the device removed. Does anyone know the starting/operating procedures and dangers of this gas heater.