1930 Ahrens Fox Quad Steering Wheel.  This rig was built for the village of River Forest, Illinois.  Fox called it a "Quad" because it had four capabilities:  a large 1000 GPM pump, a 100 gallon water storage tank and small diameter "booster" hose for quick attack; over 200 linear feet of ground ladders, and storage for over 1000 feet of large diameter hose.  Standard fire egines were typically "Triples" that lacked the ability to carry more than a pair of small ladders.  Quads supposededly filled the need for an aerial ladder truck, being able to attack the fire with its pump and to provide ladders for rescue and ventilation.  In practice Quads proved to be good pumpers but mediocre to poor ladder trucks.  This "Quad" served River Forest well until the 1960's, when the town donated the piece to the Hall of Flame.  Since the 1970's the Quad carried the directors of the Fiesta Bowl in its annual parade through downtown Phoenix.  It was restored to its original condition in 1993 by Don Hale.  

On display at Hall of Flames in Phoenix, Arizona.