I have a scanner in my CB. Generally I only hear stuff on 6 (often Spanish) and 19 (often cussing). Usually not very useful due to atmospheric interferance (particularly with the relatively poor antennas on fiberglass RVs). But it comes in handy when there is a problem on the road to find out what is going on and the best way through it (channel 19).
I gave up on my CB. I don't think that it has been on in about three years. Never once got an answer on ch. 13 and I tried that off and on for about ten years. I have on occasion listened to 19 but the language has gotten so bad that I just turned it off and a time back I had to move it to do some work and have never put it back in.