Stock Jensen stereo not working

[my65coupe]

Wondering if anyone know a direct replacement for my stock Jensen in my 2015 coachman leprechaun c class
In works when it wants to I guess. I get a different function ever time I turn ignition on
Would really like to keep the 3 camera function and ad gps if possible.
Any suggestions

 

[my65coupe]

Looks like all the direct replacements from Jensen have been discontinued.
after more research I found I can use any cheap double din head unit but will need a wiring harness for the 3 cameras.
All videos I found use a voyager harness
This is also discontinued.
Cannot find a replacement for that now
Starting to turn into a real pain.