This from Mike Summa:

The backbone of many fire departments in the 1950’s.  Palos Fire Dist. Tanker 6316, a 1955 Mack B85/Bean 750-1000.  Enjoy and comment.
Mike Summa
1955 Mack B85/Bean fire engine

Palos Fire Dist. Tanker 6316 – 1955 Mack B85/Bean 750/1000. Mike Summa photo