Abstract: Apparatus for emergency medical treatment includes a towing vehicle, a trailer vehicle, and a hitch connecting the trailer vehicle to the towing vehicle. The towing vehicle and the trailer vehicle are no more than about five feet wide to facilitate movement of the apparatus through congested areas. The trailer is provided with emergency medical equipment including a cardiac defibrillator, an intravenous fluid delivery system, a sphygmomanometer, and a removable patient cot for supporting a person receiving emergency medical treatment. A bench in the trailer vehicle, used by an emergency medical technician, is longitudinally aligned with the patient cot to minimize the width of the trailer. The trailer has a hinged roof portion which is vertically swingable from a lower closed position to an upper open position, an end door assembly which includes an end door and a movable roof panel which are rigidly connected together.