OK, there are different "Illinois"...I lived in a section that one could CC even before the new law...years ago. The DA's would not bother with such cases and the police knew this--republican Illinois.
Then there's Crook County where I'm sure even people who get permits will be tossed in jail anyways.
Leave the unlocked gun in locked container, separate from ammo in the trunk.
Want to get back OK...leave the gun in MI. Or don't visit the town. I myself, would carry, but I don't mind sitting in a jail for a good paycheck.