This from Bill Friedrich:

While not the Chicagoland area proper, this Illinois rig ended up in Eva,FD,TN.   The vehicle still is lettered up for the Mendota & Countryside FD

Specs as follows:  1985 Kenworth-FMC 1250-1250

Kenworth L700/FMC Omega fire engine in Eva, TN. This was formerly owned by the Mendota Fire Department in LaSalle County. Evan Smith photo

Tags: Eva TN Fire Department, Evan Smith, fire truck on Kenworth chassis, FMC Omega fire engine, Kenworth L700 chassis for fire engines, Mendota Fire Department