This from Mike Summa:

Hello,
This is from the Dixmoor Fire Department.  It is a 1953 Chevy/DARLEY 500-GPM panel truck.  The booster inside is 200 feet of 1 1/2 inch hose.  I guess for it’s time, this was state-of-the-art and fit the requirements of this department.  Hope you enjoy,
Mike S.
Dixmoor FD history

Dixmoor FD, 1953 Chevy/DARLEY 500-GPM panel truck. Mike Summa photo