I'm an electronics maintenance technician for an automotive supplier and work with digital equipment and processors every day. Wired will always be better when you are talking about transferring data of any sort. That being said, I have been running a rear view camera setup for a number of years now to keep an eye on my bass boat that I haul behind my trailer. I had it on my '02 Wildcat and now have installed it on my Bighorn. I have a Pioneer FB500T gps system mounted in the cab of my truck with a video input that accommodates the camera. The camera I purchased from a Canadian company that supplied the camera, cable that spans the length of your trailer, 4-pin connection receptacles, and a coil cable that connects from your trailer at the pin box to your tow vehicle. I installed both a seven pin trailer receptacle and my camera receptacle inside the box of my truck for connection. The camera coil cable wraps nicely around the trailer cable so everything is neat and tidy when traveling.
I will post some info on the company, etc. and some pics if anyone is interested in specifics.