I ordered the one from JAYCO when we had the FW built it is the GARMIN RV-760 GPS/Camera combo and I love it. I keep it on while driving and only switch to the GPS when I want to check traffic. The only time we loose signal (and only for seconds) is when we get near some of the traffic cameras on the X-way. They must be close to the same frequency as the GARMIN. It has a real good pic.
I installed a "Rear View Safety" brand system on my 2011 Eagle Superlite. It is the hardwired system with a 7in monitor and handles up to three cameras ( used that feature to add a camera to my TV). Went hardwired to avoid any interference issues associated with wireless. At the moment I have the trailer camera mounted above the center clearance lite. Like the board view that gives to see if I have cleared vehicles that I am passing ( have it wired to be on when I select rather than just in reverse). So far happy with it. Time will tell :-)