There is a module in the dash that all three cameras connect to, the module then sends one of the three cameras to the stereo on a single rca cable. The one I have in my 2018 26x is the
Voyager CSW3014, your is probably the same as Jayco typically uses Voyager Camera systems.
The connection at the camera module is a CEC type connection, which I believe is a Voyager standard. The do make an adapter do convert the CEC connection to RCA, the
Part Number is 31300006. As the camera module also provides 12vdc power to cameras, you would need a power source for them. To note ….. the white RCA is for audio, the rear camera has a mic but do not believe the side cameras have a mic.