If yours is similar to my Triplevision, it does not use RCA style connectors. The cables come to a junction box that was just tucked up and ty-wrapped under the dash behind an access trim panel beside the accelerator pedal. I had a cable come loose from the passenger side camera and had to reseat the connector.
While I love my coach, Tiffin seems to have some poor wiring practices especially in the fit and finish. Ty-wraps not being flush cut leaving a knife edge, loose wires in cabinets that become vulnerable in slides, excess cable bundled up, etc...
Hopefully yours will be something simple too. Best of luck!!
Walter & Loretta
2011 Tiffin Allegro Bus 40 QXP
2013 Cadillac SRX