I think Old Dominian has a local warehouse/distribution center here in KC. I have seen their trucks alot....but then my husband use to drive a truck for a freightline company so I probably tend to notice them more.
I don't have experience with them, but I am assuming he's driving a "pup" trailer...a "pup" is the ones that they usually pull two of at the same time....and yes it is a Semi. He's probably calling for exact direction so he knows exactly where to go since he is driving a Semi.
Anyway....you probably already have it by now.....but enjoy your new toy!