There is a federal law called the interstate safe passage firearms act.It allows transportation anywhere as long as the firearm is not immediately accessible and the ammunition is kept seperately from the weapon.Problem is,alot of police don't know about this law and you may get arrested anyways although if you follow the law you will be released or aquitted.Of course that could cost you money for a lawyer and maybe even some jail time until it gets straightened out..When I was President of our Borough Council,our chief who is an NRA member and firearms instructor didn't know about the law until I showed it to him.
So what ever you do,keep a low profile.