As long as the state you are living/driving in allows for a CCW then its legal.
The states CCW laws have little to do with it, unless the driver is carrying a concealed weapon on their person. It is a states firearms possession and transportation laws that are applicable. Texas, for instance, forbids CCW by non-permit holders, forbids open carry for anyone, yet it is perfectly legal to TRANSPORT a handgun in a vehicle so long as it is concealed within the vehicle.