Recently a bill was introduced in the Senate to allow concealed carry in all 50 states provided the holder has a valid permit in their home state. Currently the bill text seems to be unavailable, but Guns.com does an excellent job of covering the topic. Personally I think this is an excellent idea. It would avoid confusion when traveling out-of-state and the laws of the state you are in would prevail so you would still have the burden of knowing the law, but in general all states which allow concealed carry allow it in the vehicle and on the person. Often schools and restaurants with bars are no carry zones and some states have particular laws regarding printing with the firearm, but those types of rules are fairly easy to navigate and understand.
I’m sure the good folks in DC who have only issued eight concealed permits will scream and holler as would NY, NJ, CT, and MA. I’m not sure what Vermont would do since they don’t issue permits. I suppose if you are a resident of Vermont you would be allowed to carry everywhere. When your state has the lowest violent crime rate in the nation you are allowed a bit of latitude when you travel. Personally I’d like to see a training requirement in each state for a permit and an end to out-of-state permits provided all states become shall-issue. I think some states are far too restrictive and others a bit too lax, but every state is different. NC does not make marksmen out of the students, but it does ensure they have been taught our laws and they can qualify at the range. At the very least the permit application should have a gun safety class requirement. A single training class does not fully ingrain safe handling skills, but it is a step in the right direction.