I recommend using a Furrion Vision S system like the # FOS43TASF you were looking at and there's a good chance that your 2021 Keystone Passport came with pre-wiring for a Furrion camera system on the rear. If not, you will need to run the camera to a power source . The # FOS43TASF is a single camera system that comes with a 4.3" monitor.
You could upgrade to a 3 camera system with a largermonitor with the Furrion Vision S Wireless RV Observation Camera System w/ Side Marker Light Cameras... view full answer...
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