About a decade and a half ago we had a CB "Doctor" selling export rigs and linear amps from an old RV across from the local truckstop. Every day around noon he'd fire up and start playing music on Channel 19 in AM. As the truckstop sold that stuff under the counter the Doc was ran off after about six months by the local deputies. Couldn't have him walking all over the lot lizards that previously owned 19.
There’s a CB shop at a truck stop about 25 miles north of my location that advertises on channel 19, he then switches to 23 (I believe). I’ve heard truckers ask him for radio checks, etc. He doesn’t play music or jam 19 though... last I checked he was running a Connex 3300 with an amplifier - although the amplifier is usually switched off - and various base station antennas. One of the truck stops at the same exit as the CB shop has, or had, a Galaxy base station sitting behind the cashier’s area set to channel 19. Volume turned all the way down, of course.
The lot lizards are still around. I’ve heard them on 19 during many a band opening.