Welcome, Yoda! It's good to have you here!
Assuming you are going to be able to carry while on the road, I'd like to mention a story that came up on this forum a couple of months back because I think it might especially apply to you (it applies to everyone equally really, except that you are on the road much more than the average person).
If you want to know the details of the story, just use the forum's search tool. Suffice it to say that one of our members here found themselves in a road-rage incident on I-15. The situation with traffic made it impossible for him to get out of the incident by slowing down/speeding up/exiting the freeway. I don't recall exactly what the perp was doing but he was making life-threatening actions against our member (drew a gun or was trying to ram his vehicle into our members, I don't recall which); again, the details are fuzzy to me.
But the details don't matter much. What I realized from the story is that while driving down the street and/or stopped at a light in the city, it's very easy for a perp to take a life-threatening action against me. Merely having my firearm with me is *NOT SUFFICIENT*. In other words, having it tucked SOB or IWB with my shirt/jacket and seatbelt effectively disabling my ability to access it is a bad move.
I recommend you give some good thought to how you might access your firearm, should you need it, in a high-stress situation such as cruising down a freeway thick with traffic. Granted, with a big rig the truck itself MIGHT be a better weapon at times but at other times it might not (for example, inadvertently ramming other vehicles).
Make sure you have easy access to your tool, even while driving!