There is not a companion license plate camera for the Furrion Digital Wireless Observation System FOS48TAPK-BL that would allow you to go back and forth between the truck and your camper. What you could do is use the Rampage Wireless Backup Camera # RA7710, which is magnetic so you can place it wherever you like and is also wireless; it syncs with your smartphone so you would not have to deal with two monitors in your tow vehicle.
I've added a link to a video review of this backup camera... view full answer...