My coworker, now a retired friend, also has a Rockwood ('04), and his Concertone also died. He's taken the head unit apart and said is was disposable. So poorly made that it wasn't worth rebuilding, and no way he'd pay $500 for a new one now that his warranty has expired.
He was the one that replaced it with a JSI stereo (not JVC, sorry), 400 Watt, model JS5010. I bought mine at my local Sears, but you can probably buy them online as well. As mentioned in my earlier post, it lacks a TV tuner, so I planned on adding a VCR with it for this function.
I noticed Rockwood used quick splices behind my Concertone unit. Jeez I hate these things. Always had mixed results when these were used on trailer wiring, and ultimately had to replace them.
Here's a picture of the installed unit in my friend's Rockwood:
In these pictures, the Concertone head unit was still in place, though disconnected. He plans on making a matching wood frame with speaker cloth, to cover the hole. I would probably make a small instrumentation panel, with indoor/outdoor temp, battery voltage, line voltage, etc. (I am a geek ya know).
My S/N ratio is fine in the stereo/cd/dvd modes. But the TV tuner is junk. It is easily overdriven. The concept was an excellent one, but was very poorly built. I'm on my second unit, and my warranty just expired (camper is a year old this month). I already bought the JSI unit just in case, and have it in my garage, ready to go. I figure it's only a matter of time before the replacement fails. One of the button lights has already died, another one is twinkling.
When/if mine does fail, I don't have a shelf available like in my buddy's trailer. But the panel that the XM receiver is mounted in has nothing behind it. Wasted space. I'll cut that panel out, trim it, put in a shelf, and mount the JSI unit and a VCR:
Hope this has been helpful.