Welcome.... there is nothing that will use the exact same wiring or size...though there is a Genesis 3.0.
Other makers with similar configurations include Jensen and Magnadyne.
If you want to actually improve the quality of build and sound and support...you could look at the Alpine players alpine car dvd player at Crutchfield.com
...but obviously some mounting modifications would need to be done.
Crutchfield is usually a pretty good place to see what is out there in terms of car stereos...but the field of RV wall units is limited....and they all suck ...sorry to say.
If you're not comfortable doing the work yourself...stop by any local car stereo shop with your rig and I'm sure they can give you lots of alternattive ideas & mounting suggestions based on your actual configuration.
Here's the Concertone/Genesis site as you may want to make that your first stop/contact. http://www.concertone.com/online_store.html