I have a 'TIN' ear, but even i can hear the difference between a good CD and some of the files on youtube
besides why go thru the trouble of hunting and downloading 100's of songs you already have on CD
YES i would probably just buy a new single slot CD in dash unit,
i put a Sony in this RV a few years ago
a 12 or 24 cd case has holds more music than your 10 CD changer, and takes up very little space
and many have a USb input port, so you can copy (rip) your favorite CDs to files and put them on a cheap memory stick
100's of Mp3 songs on a $4 2gig memory stick