Probably too late to help but jut FYI *technically* in AL you need a permit to carry a pistol in your car, except in some very limited circumstances (like bringing it home after buying it). No routine driving around with it.
It actually one of the only really "bad" firearms laws we have in AL. They tried to do away with it recently in a broad revamp of the state firearms laws but for some reason the change didn't make it into final bill that was passed.
That said, I've never heard of anyone actually getting ticketed or arrested for it and if you are just passing through you're probably covered the the federal transport laws.