This from Dan McInerney:

This is our new ambulance, a 2018 Ford F550/AEV. It features four wheel drive and a power cot. It will run out of OPFD Station 1 with A612, and manpower permitting, A613 will run out of E603. 
Oak Park FD Ambulance 611

Oak Park FD Ambulance 611. Dan McInerney photo