Hi, thanks to everyone who read my post and to those who replied.
@ guskmg, if you want some suggestions I can send you some links to units that still have dvd players and even more current bells and whistles.
I really wanted a unit that had built-in wifi capability as well as a true android operating system. Personally I get my movies streamed, or when in a campsite with limited wifi, I will soon be able to play them from my laptop or phone and transmit wirelessly to the tv through the radio. I haven't used a DVD or Bluray in years.
I ended up buying a moderately priced unit off of eBay and it arrived from China in 4 days. Not too bad.
I received an electrical diagram from Airstream directly this morning. I was amazed at how quickly they sent it out. I will attach them here.
At the end of the day, the issue isn't quite as bad as I thought. I need to disconnect the Sony plug that was crimped onto the Airstream wires. Radio wires are thankfully color coded. I need to then connect those wires to a generic male ISO radio harness that I just purchased. I need this harness type because that is compatible with what my new radio came with.
I suppose I could just cut off the female ISO harness from my new radio and crimp connect the wires like they did with the Sony , but then I'm in the same boat if I ever do this again.
So detach the 13 wires from the Sony plug. Take those 13 wires in the airstream cabinet and connect them to a male generic iso harness. Connect that to the female ISO harness that came with my radio and then plug the other end of that into my radio.
That takes care of the 13 wire thing.
Next are all the RCA cables that are orphaned and were not connected to the Sony. Here's where the wiring diagram also helps. I now have an idea what these should be for (not sure why they were ever disconnected) and can test them to identify them and then connect them to the new radio properly.
I will work on this over the weekend and will take some pics to post after.
If you are curious, this is the unit I bought. Not sure how it will hold up in the long run, but people have had good things to say about the "pumpkin" brand. At a couple hundred bucks it is a calculated risk. Looking at it though, it seems well built and everything is well labeled.