Pretty sure that the Windsor division of Verspeeten (Moe's) runs all the drop decks that they have and was all on dedicated loads, when I was looking for that equipment a few months back.
Forgot about a few of them below and learned some roe that might have them.
Usually moving companies have them, and yes they are also run on automotive. But players like Verspeeten are running dedicated, meaning freight in one direction, dunnage back.