I have the 12v schematic for my rig, which would be close to yours for the most part.
The fuse you speak of goes directly to the switch which powers the two lights above the couch, then around all the way back to the light in the water compartment, then to the light in the basement, all the way to the front cap LED strip, around to the light in the curb side basement. (AKA "trunk")
It doesn't show it going to the camera, but there is no wire showing for the camera.
2016 North Point 341RLTS
2012 F-350 Lariat CC SRW