CB Radios?
The main point has been missed in this discussion. Congress mandated a 55mph speed limit in the mid-70's (down from 65 or 70), and speeding tickets were quite expensive. A CB radio was how truckers avoided tickets, and the general population of people who drove a lot wanted the same "protection." (This was a bit before radar detectors became viable consumer products).
CB's were mainly about avoiding speeding tickets.
The trends of every decade are always stupid, whether characterized by long hair, dope, tattoos, black fingernail polish or whatever. Always stupid.
This is because it's all about kids and marketing. Kids are generally stupid and inexperienced, and perpetually want to do things to irritate their parents. Each generation of parents has a good tolerance for their own generation's idiocies, so their kids have to take it a little bit further or go off in a different generation to achieve the desired level of irritation (of their parents). When I was a young adult, we were all hip and agreed that we would NEVER give our kids a hard time for letting their hair grow long. So our kids had long hair AND got heavily into "controlled substances" that we would never have used. Guess we weren't as cool as we thought.
Marketers want to feed that desire to be irritating in order to make money. Kids buy records, tapes, CD's of bad, irritating music, they buy goofy clothes and accessories, and retailers get rich.
Most people see the stupidity in everyone else's decade but think their own decade (basically, when you were in high school) as being forever cool. It is all a ridiculous conceit. History proves that only the 60's were actually cool.
Class of '67.