I've never once used the CD/DVD part of the stereo in both new RV's I've purchased in the last five years.
Rather than replacing the radio, go buy a decent BluRay player ($50-$100) at Walmart or somewhere...
Much less expensive than buying a new stereo unit...a lot easier to install (believe me
)...and will work much better!
You can still use the current radio for audio and radio functions.