That is entirely dependent on the state and on the company that the driver is employed with. Lots of local truckers have permits. Now that many states are reciprocal, its not the big hassle that it used to be. If you are a driver for the state or federal government, they have their own regulations for that and I'm sure that they are pretty stringent.
Question for LEO out there. How does concealed carry affect drivers of commercial vehicles? Is cc prohibited to those drivers by the federal gov. or state? Thanks!