The backup camera in my coach was a low resolution camera (Panasonic) connected to some $100 radio using the Aux input for a camera. It was pretty bad in the daylight and useless at night as it had no IR lights to illuminate anything. While the original camera was hard wired from back to front, I was hoping to avoid running wires, so I thought I'd give a wireless system a try. I read good reviews about this system on Amazon, so it's the one I picked:
Amazon.com: AMTIFO A11 HD 1080P RV Wireless Backup Camera 10 Inch Monitor...
It has a large 10" 1080p monitor (with TF memory card slot for recording) and can view up to 4 wireless cameras. I chose the single camera setup above, to use as my backup camera, then I also purchased this license plate camera to be used for my hitch camera:
Amazon.com: AMTIFO H28 Wireless Licence Plate Camera compatiable with...
Here's all of the parts that showed up 2 days later:

The install manual tells you to check everything first, which I did. It all worked and the picture was very good. I even turned off the lights in the garage to see the picture with IR and that looked great too.
I installed the license plate camera on the license plate and ran the wire through the hole for the license plate lights. I made a notch for the wire in the corner of the license plate light hole, to be as unobtrusive as possible.

I wired the power/ground to the license plate light circuit, so to energize the camera, I just need to turn on the running or head lights.

[imghttps://www.foreforums.com/index.php?action=dlattach;topic=42377.0;attach=109716;image[/img]http://I then removed the intake grate where the stock camera was mounted.

I needed to open up the opening for the larger camera and IR leds to shine through.

Once again the trusty aluminum angle came into play as I made a mount for the new camera. I did have to squish the camera mount, to get the camera closer to the base for the smallest opening possible.

Installed the intake grate and dropped the power wire down the back of the coach into the engine compartment. For power, I chose to tap into the constant hot chassis power for the engine bay light. I put a 5a fuse inline and will likely remove the fuse if the coach is going to sit. I don't think there will be an issue with it being powered all the time, so while on a trip, I won't bother pulling the fuse.

Here it is poking out of the intake grate:



I have not yet installed the monitor as I have a Ram Mount suction cup mount and arm on the way. I've decided to hang this from the front cabinet above the driver for easy viewing.
The screen can be set to display one camera, both cameras, 3, 4, scroll through, etc. In my application I'll leave it on the rear view until I need camera 2 to line up with a trailer.
One other thing...when the unit arrived, there was a bit in the manual that says if you email them with your Amazon order number and the link to the system you purchased, they will send you a free item of your choice. This can be a suction cup mount, 32GB TF card, cigarette lighter 3-way adapter or ANOTHER CAMERA. Needless to say, I believe my second camera is on the way. I'm thinking I may use that on the back of my camera for a way back view.
I'll post an update once I get the monitor installed.
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