After much debate and angst I realized that it would simply be foolish to replace the non-functioning Concertone with another overly priced under-performing and un-reliable RV specific dvd/stereo unit.
I figured their had to a better way, and this is my solution.
I purchased a Pioneer AVH-X3500 BHS Double-DIN multimedia car stereo head unit. This stereo will play dvd's, cd's, mp3's via the USB drive,and music from my iPhone. It is Bluetooth capable (will stream music from my iPhone via Bluetooth), is satellite radio ready, and Pandora internet radio ready. I picked one up from Future Shop for $299 and went to work.
AVH-X3500BHS - 2-DIN Multimedia DVD Receiver with 6.1" WVGA Touchscreen Display, MIXTRAX, Bluetooth®, HD Radio™ Tuner, SiriusXM Ready, and AppRadio Mode for iPhone® | Pioneer Electronics USA
I ripped the old Concertone out and disposed of it accordingly (abiding by the forum firearm policy, I will not post the video of it's demise, needless to say it was ventilated well)
I fabricated a new insert in the space between the cupboards with room for the stereo and added a new little nook with electrical outlet and USB drive cable attachment.
The Pioneer has a Video output, which was crucial. I connected it to my tv and any dvd inserted now plays on my tv.
I use the stereo fader to control output to either indoor or outdoor speakers (or both). This works just fine.
I added a power switch to copy the car ignition switch function. This allows me the ability to turn off the main power to the stereo while retaining separate power that keeps my radio presets and preferences saved.
I added a second switch to create a parking brake bypass. This allows me to fool the built in parking brake feature on the Pioneer. In a standard car installation, you cannot watch video on the main head unit screen unless the car is parked and the parking brake is activated. This way I flick the switch to mimic the parking brake being set and can then see the video play on the head unit if I wish. (The "rear moniter" output, in my case the TV, functions regardless.)
The Pioneer is 1000% the stereo the Concertone ever could have hoped to be. It has far more features, far more power, and their is just no comparison in quality.
I have tested the DVD function (both purchased and burned), the radio, played music from my iPhone via the USB drive connection and via Bluetooth. (When the iPhone is connected to the Pioneer I can control music selection via the Pioneer's touch screen. (the iPhone can be connected and hidden away).
I think that about covers it, installation was relatively easy, I just took my time, took a lot of pictures and made a lot of notes regarding wiring.