Here is a Chicago Fire Department texture pack for Medic4523's Spartan Gladiator Classic (MX7000) pack. Chicago Fire Department has one of these Spartan Gladiators still running on the streets of Chicago responding to calls.

Medic4523's Spartan Gladiator Classic (MX7000): https://modification-universe.com/f...ladiator-classic-mx7000-rotator-lightbar.687/

Also, one important thing, since Chicago Fire Department trucks tend to have the red wheels, I recommend you downloading this: "Common Textures for all Medic4523 Models" to change the default rim color to red for realism.
Link: https://modification-universe.com/forums/resources/common-textures-for-all-medic4523-models.43/