This from Mike Summa: 

Taken from the Oak Forest Fire Dept. Facebook page is the refurbished 2005 F-450.  Work done by Everest Emergency Vehicle.  Box was taken off old chassis and rebuilt.  New box placed on 2017 F-450.  Also ordered was a Stryker Power-Load cot system.  Amb 39 will run out of station 1.
Mike Summa
Oak Forest FD Ambulance 39

Oak Forest FD Ambulance 39. Oak Forest FD photo