From the Fire Service Inc. Facebook page:

Thanks to Chief Jeffery Springer and the Chicago Heights Fire Department on the new order of a 2018 Wheeled Coach F-450 ambulance. This is Chicago Heights’ third Wheeled Coach and is another excellent addition to their busy EMS fleet. The new unit comes equipped with Whelen LED emergency and interior dome lighting, Liquid Spring Suspension System, custom interior cabinet configuration, LED compartment strip lighting, power cab and module door locks, OptiCom emitter, Federal EQ2B siren, Vanner inverter, custom SCBA/gear compartment and extended conversion warranties. We congratulate the CHFD and appreciate their continued business with Fire Service Inc. and Wheeled Coach. Delivery in approx 90 days. We will post additional pics once the unit arrives. 

drawing of Wheeled Coach ambulance

Chicago Heights FD ambulances

 interior of new ambulance