does the camping world rep have an rv? lots of folks on here with rv's including myself have a wireless b/u cam they got off ebay or from costco or sam's club.
got mine off ebay and the rearview mirror with monitor for less than $40.00. tapped into 12v on a light fixture for each end and put an LED remote control switch on the camera power feed. turn on the monitor, turn on the camera back up and turn it off. i use it to check the bikes on the rack once in a while as we roll but its not a rearview cam.
but its your rig you can do what you want