Federal Law is supposed to beat any state gun law when traveling through a state. To me that means I can have a gun in the car if I'm traveling up the North East corridor but I'd better have it unloaded and locked in a seperate metal container locked in the trunk. The ammo is stored in a separate locked container and I'd better not plan on spending the night but rather pass right on through. It's not worth the effort so I don't go to the NE or I leave my gun at home.
I check the individual state gun laws before I leave home. My VA CCP is valid in about 6 other states but not GA so I have to carry open. That's ok, everyone in the North GA mountains carries open. The CCP to get is FL. It is recognized in something like 27 other states. I've never applied because it's costly and I don't travel so much anymore but FL is a must issue state so it's easy to get. You can do it all on line.
Without a doubt states with CCPs have lower crime rates because no one wants to take the chance that Grandma is carrying. VA is a good example because it's easy to compare it to the District or Maryland. Take care, Lisa