I have an 08 Tuscany 4076, here is what I have found out:
The unit was supplied by Mobil Optics, based in Utah. They
are out of business. The unit was an unbranded version of
a Nesa 6510 double din also known as Nav6510.
It is no longer available. The camera controller might be still
available from Viewmor LLC, 801 648 9289, Landon Costley is
the contact. They purchased the inventory from Mobil Optics
out of bankruptcy. IF the controller has gone bad, as mine did,
then this might be a fix, if they have any units left.
Otherwise, you are SOOL. And will have to find another solution.
I have realized/learned that I don't really need any cameras.
The side ones were always useless(JMHO), and I have
found I can do without the rear also.
I just have to get out and look, or have a spotter
when backing up using a walkie talkie.