I installed a custom wireless setup. Used an a/v transmitter/receiver combo I bought off eBay. Here's one with the same specs:
AV Wireless Audio Video Transmitter Receiver 2500mW YY4 | eBay
Here's the license plate camera:
Amazon.com: Boyo VTL420C Universal Rear View Camera: Electronics
Benefits of wide angle rear vision, goes without saying.
No extra set of connection wiring at hitch (or running the length of trailer)
Chrome finish on Boyo degraded after 1 year.
Tooling around our interstates with a 2500W video transmitter is probably in violation of FCC reg's
I'm sure the transmitter is pumping out some serious EMF (I've got it on a power switch, but I'd hate to accidently leave it on, since it's directly below the head of the rear bed).
Had to build a custom box with a larger cooling fan for the transmitter since it would get very hot, and it's located in a tight space.
My trailering skills have suffered, as I've become very dependent on having a rear camera while underway. Makes passing a breeze...
I've been using this setup for about two years now. It's been very reliable, only occasionally loosing signal. I piped the trailer receiver, and tow vehicles rear camera into a passive video switcher, so I can switch easily between the two.
For what it cost, it's OK, but I'm planning on replacing it with a wired setup, as soon as I can decide on components. I'm not crazy about polluting the air waves, or drawing that amp while underway.. every little draw adds up, since the hydraulic actuator can pull upwards of 16A, and the furnace fan (winter trailering) is somewhere around 8A.