This from the Fire Service, Inc. Facebook page:

We are pleased to announce that the Oak Lawn FD has recently puchased two additional Type I Wheeled Coach ambulances. These new 2017 F-450 models will supplement their existing fleet of Wheeled Coach units… and will feature our “CoolBar” HVAC systems, custom interior cabinetry configuration, all LED emergency and interior lighting, as well as, numerous other custom features. Production of these two new units will begin immediately, and we anticipate completion within 60 days. We will post pictures once the units have been completed and are ready for delivery.