I use one for work. Wouldn’t be without it. Not a week goes by it doesn’t save me significant frustration, time or money.
For the private vehicles — TT & TV — I like having communication potential. On the road, or off. I see no reason to assume cell phone service will always work.
Just last year I caught a guy asking for help on the CB. as his phone had died. He was off the main road. I pulled over and used my phone to contact & make arrangements for service.
Many drivers don’t use them if at all nowadays as it’s become difficult to with today’s plastic tractors to achieve worthwhile service. It’s time & effort.
That man told me he’d been asking an hour for help. Bad health and a 105F Texas summer day had kept him from hiking down to main road. Said he’d probably have had to wait till morning once things had cooled and the shop he needed re-opened had I not picked him up.
As a driver you plan for that problem, but no one ever enjoys it.
I’d say that it’s in bad weather a CB is worth the most. Immediate notice of a problem with road surface or wreck.
WAZE etc, aren’t close. Only OK. With CB and 760 Garmin GPS , I dumped the WAZE app as it wasn’t useful. TRUCKERS PATH I use all the time.
There’s more drivers out there than one suspects have radio on and are monitoring. Just may not respond to most of the Bull.
I have a fair amount of gear. But for any given tractor I have about $6-700 in replacement cost of gear installed. (Mainly due to a HAM quality DSP external speaker). I have the same shop do a transceiver alignment and use an antenna analyzer to cover basics (
www.claysradioshop.com). Other than that I do my best on vehicle bonding.
Www.k0bg.com
There were some really outstanding CB radio setups in TTs in the 1960s and 1970s. My Dad had a Johnson Messenger in his 1975 Silver Streak That was superb. I could pick him up out on the local highway and get to his camping spot easily.
One has an interest or not. If it’s considered like the trouble we go to on so many other things (upgrades) then it’ll pull in some signals when at some locations that are surprising (not skip).
Local truck drivers, especially in groups, can be pretty funny as they wake up and all of them get down the road to the first load of the day.
And there are locals in their cars still in some areas running around on a Friday night, just chattering.
Both are good for local info. Tire dealer. Auto parts on a Sunday. Fish fry at the volunteer fire department. Etc.
As AM radio has been destroyed by corporate greed compared to what it once was, much of that pleasure is gone. After dark long-distance reception from famous stations hundreds of miles away was the challenge with a long wire antenna. That was always fun. Blues out of Memphis. Jazz out of NYC. Western Swing out of Tulsa.
Coming out of Denver and making US-287 then tuning to find, Bill Mack & The Open Road Show from Fort Worth in the dark hours. The faint sounds of home pulling us hither.
But a good AM radio receiver is still, IMO, a “requirement”. There are still local stations to give one the flavor of a local community. Contact info and addresses. Not everything is in the Net.
Consider all of these together. Look into the thing as a whole.
If push came to shove I’d rather have the radios than the TV. I already know from experience their practicality. Throw in a modern Uniden scanner and the pictures complete.
Setting up camp was (is) setting a radio or two. Ready.
Moral of the story is try them out first. 
Linear Mode
