I purchased one of the cheap $50.00 Rearview Mirrors with the built in TFT display units. The display measures 7 inches on the diagonal
Clips over your existing rearview Mirror. Patched the wiring such that it is On when powered rather than just when in reverse.
The camera is also one of the cheap ones $25.00. It has the infrared LED's so it can display after dark without backup lights. It also has the distance lines embedded in the camera.
Mounted it about 6 feet off the ground on the rear of the trailer. Tipped it out so I can see the horizon behind me
Used a piece of White Plastic wire cover to feed the cables straight down the back of the trailer
The cabling for the video signal I used was RG6 coax cable with standard threaded ends. I made the wiring as weatherproof as possible with liquid tape. I bought Threaded RF to Phono adapters at HD for like $5.00 for a pair. Routed the coax and power from rear to the tongue and just used standard RF threaded Male female for the quick connect at the bumper
Power the mirror off the hot wire in the headliner for the courtesy lights
Power the camera off the running lights on the trailer
Just means I have the running lights on going down the road and that is how I roll anyway
So far best investment I made for safety on the trailer
One Kamkazi on a Kawasaki making the weave where you are about to move to is reason enough for me! I don't need the problem.
Wireless Camera's will have issues on travel trailers for a few reasons
The distance from the transmitter/reciever Most have a maximum of 25 feet range at the best of times, The number of metal walls you are trying to get through, Wireless signals and metal walls don't like one another,
The fact that all of the wireless units run in the same frequency band as the Wifi signals at your local coffee shops and Bluetooth connections for your enabled phones. We have a Blue tooth connected phone to make it hands free. That is why I went sheilded and hardwired. Coax works good for cable tv video signals so why not. The picture is as clear as can be. A little bleed on the colors when the camera is facing into direct sun but still viewable.
Is this hard to install No
Does it take some time Yes
Took me 3 evening of messing about but I wanted something that was well hidden in the truck and weatherproof on the trailer
When we hitch up the trailer I plug in the clip on mirror
If you have any questions drop me a note
Personally I think this kind of a camera setup should be standard equipment on trailers from a safety prospective
I have 3 small grandchildren and God forbid something happened to one of them when I was backing in the rig.