This from Tyler Tobolt:

I will provide a running list of ambulances currently on order that I’ve gathered either from word of mouth or board meeting minutes. Ambulances are much harder to find information about when compared to  fire apparatus. These are also between 2022-2024 

Algonquin LITH – Freightliner/Horton Type 1
Aurora – Ford F-550 Type 1
Bensenville – (2) E-450/AEV Type 3
Berwyn – (2)  unknown specs
Bolingbrook – Ford F-550/Wheeled Coach for M3 & M4 
Chicago Heights – (2) unknown specs
East Joliet – 2023 Ford F-550/Horton Type 1
Elburn – Ford/Horton
Elgin – (3) Ford F-450/Wheeled Coach Type 1 
Elk Grove Village – Ford F-550 Type 1
Evanston – Ford F-550/Horton  Type 1
Evergreen Park – unknown specs
Fox Lake – AEV Traumahawk Type 3 
Glen Ellyn – (2) unknown specs
Hampshire – unknown specs
Inverness – unknown specs
Lisle – (2) Ford F-550/Demers Type 1
Long Grove – RAM/Horton Type 1
McHenry – (2) AEV unknown specs due Oct 2024
McHenry – (2) Wheeled Coach unknown specs due Oct 2025 
Minooka – Ford/Horton 
Mundelein – unknown specs
Naperville – (2) Freightliner/Horton Type 1
Niles – unknown specs
North Aurora –  Wheeled Coach
North Maine – unknown specs
Orland – Horton unknowns specs
Plainfield – Ford unknown specs
Pleasantview – approved, not officially ordered
River Forest  – unknown specs
Rockford – (3) Ford F-550 Type 1 
Rockton – Ford E-450 Type 3 unknow specs
Westchester – 2026 F-550/Wheeled Coach Type I
Westmont – Ford F-550/Horton Type I