Bottom line is that since you are asking this question, I'm pretty sure you have NOT attended the IL required firearms class. Therefore you cannot carry, open or concealed in the fascist state of IL. You can, however, possibly carry a firearm unloaded and in a case in the truck or luggage compartment of your vehicle under the safe-passage doctrine provided that what you have is legal both at the start and the end of your journey. And this assume that some over-zealous LEO doesn't ignore the law and arrest you anyway if your firearm is discovered.
Don't stop in IL for any reason, don't get stopped for any reason, and you probably will be ok. But as always, it's best to avoid that hell-hole entirely if at all possible.
Don't stop in IL for any reason, don't get stopped for any reason, and you probably will be ok. But as always, it's best to avoid that hell-hole entirely if at all possible.