Anyone use a wireless backup camera on their trailer?

Be careful about the range of the signal. I have one, and it reaches from the back of my 21 foot TT to the dash of my SUV. But not much further. And that's only because I put the camera in the back, but the transmitter is midships, near the only 12 volt outlet, maybe 25 feet apart at most. Those signals will not penetrate much in the way of glass and steel and fiberglass and stuff.