This from Jeff Rudolph:

Lake Villa FPD took delivery of 2 Ford F 550 4×4/AEV ambulances. They will replace the 09 Osage, and the 13 AEV. An additional unit will be purchased in 2018, making all 4 frontline and 1 reserve units identical. Jeff Rudolph

Lake Villa FD ambulances

Two new Type I AEV ambulances for the Lake Villa Fire Department. Jeff Rudolph photo