This from Bill Friedrich:

In this series I will go through the history of each of the Turret Wagons starting with 6-7-1
Organized at 1244 N. Orleans on 12-14-61
(G-164)  1961 Willy’s Jeep. FD repair shops fabricated the body and installed a high pressure monitor
capable of flowing 2000-gpm
Disbanded on 2-25-77
Chicago FD Turret Wagon 6-7-1

Chicago FD Turret Wagon 6-7-1. Bill Friedrich photo

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Organized on 6-20-78 @ 55 W. Illinois St
(G-374)  1975 Chevy C20. In 1978 the CFD Shops fabricated and installed the body and twin Eastman HP monitors
capable of flowing 4000-gpm
Chicago FD Turret Wagon 6-7-1

Chicago FD Turret Wagon 6-7-1. Bill Friedrich photo

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Organized on 2-8-86
(G-366) 1975 Mack MB607T. In 1976 the CFD Shops fabricated and installed the body with twin stang hydraulic high pressure
deluge monitors capable of flowing 20,000-gpm
Chicago FD Turret Wagon 6-7-1

Chicago FD Turret Wagon 6-7-1. Bill Friedrich photo