BRILLIANT comment!
I have wondered about that option for a long time and NO ONE seems to know about it. Many CD players for the car have an interface to hook up to an external changer. I have NO idea what kind of plug you need. (Are they standard? Or does every brand have its interface so you can only use, say, a Sony changer with a Sony head unit?)
Is there anyone else out there who is into car stereo that can shed some more light on this? It HAS to be a better option than playing through the stinkin radio or cassette player!!
W.