Steer clear of New York
Beware of Maryland
Maryland has cameras at the entrances to their state along the interstate highways. these cameras look for out of state plates. Once an out of state plate is detected, the owners name is found and then checked with the National gun registry. If your name is on the list, the local police are notified. Should you stop in their state for any reason and a police officer happens to see your vehicle, you will immediately be stopped and if carrying, arrested for gun possession.
Maryland has the strictest gun laws in the nation, New York is second, and Massachusetts is third. Several other northeast states are also anti-gun.
Illinois recognizes out of state CPL permits BUT, you must not leave your vehicle with your weapon. Your safest bet when traveling through or staying in Illinois is to unload your gun. encase it in a locked container out of reach from the drivers compartment and also lock the ammunition and magazines in separate container.
Advice, if you carry. put in a safe/ lock box for your handguns, and a separate one for your ammo and magazines.
Steer clear of Northeast USA.
As long as you stay on the Interstate Freeway system and do not get off for any reason at all, Federal laws allow you to legally transport through an illegal state as long as you are coming from a state that is legal and going to a another state that is also legal.
New York is a really big state.