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What is your application version?
I put my application version into the mopar website this afternoon and it tells me "Our records indicate you have the most recent map update for your vehicle. Please check back soon for a map update product."
If you don't have the window sticker, FCA also has a site were you can add your vin to the URL and get the window sticker with all the options and specs.
https://www.chrysler.com/hostd/windowsticker/getWindowStickerPdf.do?vin=YOUR-VIN-HERE
Here is an example
2022 Ram 3500 Chassis Cab
I also found this little gem. It works with the Brandmotion cargo camera, but adds a soft key, not wired switch. Added bonus, unlocks Nav in Motion.
https://www.camerasource.com/2018-ram-multi-camera-input-navigation-unlock-interface
So, to answer the OP's question, yes, you can add a cargo camera to your 2018 3500 and switch between the back up and cargo camera.
The video I posted above is one option that adds the soft button for the cargo camera to the backup camera screen. Works exactly as the factory version. It will...
Yeah, every year something changes with the trucks.
I don't think that is the camera wire. That is most likely a GPS Fakra connector, as that aligns with the old location of the GPS antenna.
The factory cargo camera in the brake light uses a single connector to route the brake and bed lights...