Take a close look at the radio unit, somewhere it will have a model #. Really need that to get more information.
I'm sure the unit is worth using, Pioneer makes a great in dash receiver, for radio or satellite if you add that service, and just playing audio discs.
The navigation is likely going to be quirky and outdated, I think they stopped using navigation DVD quite some time ago, but still, if you can get the disc on ebay for $20, that's not a bad to have as a backup.
The trackvision unit commands some impressive prices on the web. It looks like a two part system, the dome on the roof and a receiver "cable box" inside the coach. Do you have the receiver box?
https://www.google.com/#q=tracvision
2013 KZ Sportsmen Classic 200, 20 ft TT
2020 RAM 1500, 5.7 4x4, 8 speed