A question I've always wondered about - are commercial drivers, by virtue of their licensing to drive commercially, and while doing so, less able to legally carry?
Yeap. The Hattie Mitchell letter cleared things up a long time ago, but that doesn't prevent truckers from assuming things. You have no idea how many drivers I have met, who believe that you cannot carry a loaded firearm in the cab of your truck with you. Considering where most OTR drivers have to sleep, they are far more vulnerable to violence than the average citizen living at home. It would be lunacy to outright ban their ability to defend themselves. Granted, that doesn't stop some state legislatures from being lunatics.
Fortunately, all of my commercial driving is done in Virginia, so I have no worries about such things anyway. The only military installation I ever have to enter for work is Fort Pickett, and I am cleared to possess my 1911 while on base.