CBs are still being used by the truckers...just not as much as they used to be. They are so cheap, simple, and universal they remain in use to this day. Of course, some truckers and many RVers are now using smartphone apps, GMRS, and FRS radios...but for the truckers, the CB (and ch 19) is always the 'fall-back' radio to use for getting highway and local information, as well as reporting accidents and lane closures and such that they see on the road to other drivers.
Many of the large vendors still have a sign at the truck entrance gate that tells the drivers to use ch 12 or ch 5 (or whichever) to contact the office for loading or unloading information, communicate the appointment time, load number, etc. Then they are told to park in the staging area and wait for a door number. Its all very efficient and simple, but if the driver does not have a CB, it takes a lot longer. They may have to walk a LONG way across a large shipping yard and try to find the right door and then wait in line behind a dozen other drivers waiting in line to sign paperwork.
Some vendors ask the driver at the gate that if they dont have a CB then they can provide a phone number...and I've done this also, although I would much rather use the CB and not have to give them my number.
It varies. But CBs are still in use...and can come in handy even for RVs and vans etc, especially when you roll up on a traffic jam in a major city and you can listen to the truck drivers a half mile in front of you telling each other what is going on and which lane is open.
Wow....ramble mode OFF.