You can definitely use the two wires to power the camera and transmitter. I used them for a Furrion camera that I brought over from my previous trailer. There is nothing behind that WiSight bracket besides a hole in the wall. Depending on how big it is, you might be able to simply tuck the transmitter inside the rear wall. I made a mounting plate for the Furrion out of a black plastic cutting-board (cut to the correct shape). The WiSight mounting holes are spread farther apart than the Furrion holes, so I wanted to cover them up with a mounting plate.
2021b Micro Minnie 2100BH
2017 Ford F-350 SRW diesel
Previously: Grand Design Reflection 28BH