I have one sitting in the shed somewhere if anyone wants the useless bit of crap! It was supposed to work over a distance of 80 metres but failed to work over a distance of 8 metres!
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I have a wireless camera as it came with a GPS and is very average at best.
I will be hard wiring it and replacing with better camera.
I have tried to keep my dash wire and clutter free. Thats why I have a replacement rear view mirror (not a clip on as they are too heavy and the mirror moves down - especially off road) with built in monitor and a double din set up with on and off road GPS software etc. I even have a UHF with a remote head to keep things tidy. When I purchased the Patrol some years ago I decided I did not want the spider web of cables and crap I had in the previous 4by.
I just bought a Swann security system for my home. It has 12V HD colour camera's with infrared night vision which will display colour if the visible area is artificially lit. They're about $160 & weather proof so I bought an extra one for the car/camper. I already have a screen with 2 RCA inputs & these cameras have an RCA output with 18M extension which you can also buy separately. You just need to make sure the power supply meets same amperage requirements which isn't hard. In my case I have an inverter so I'll just use the transformer they supply for it. There's very little wiring involved. It's basically concealing the cables & plug them in. They have a 60deg lens angle which is plenty for this application. I also have a black & white camera with an 85deg angle & it's too much. You can have the camera on constantly or you could easily add a switch into the positive power wire to the camera which, if you wanted to could be taken from your reverse sensor on your gearbox. I have mine on a switch in the dash but when travelling with the camper trailer I have it turned on whilst driving as it replaces the rear view mirror very well. The only downside is they're not very small & therefore not easily concealed if fitting to a car but on a caravan this wouldn't be such an issue.
I've tried those rear vision mirror style reverse cameras, TBH just from the sheer weight of it I was forever readjusting it.
I would not like to see how they go day in day out on a rough road, Not for me,
I think 4 sensors might work better unless you really need to see behind you .
The mirror I picked up is not a clip on - its a replacement. As well as the built in monitor it also has a forward looking camera that records on to a SD card, with a G sensor that locks the video file in case of an accident. Very neat and clutter free with one small cable that I have run under the roof lining.
As far as rear vision goes when travelling with a big caravan - those that say it isn't necessary either have ESP or they don't really tow a big caravan! You just can't get too much rear vision when towing IMHO.