Just fitted this camera. To 4.2 M car and 6m caravan.
The 5" colour screen simply plugs into a cigarette lighter socket and mounts to your car's dash or windscreen using the suction cup bracket. Other features include infrared illumination to improve visibility in the dark, reversing guidelines, and 12-24VDC operation, making it also suitable for...
www.ebay.co.uk
Not road tested yet but quality seems good from my backyard tests. I've velcro camera to rear window blind handle, so inside. Power from readingl light circuit.
Monitor mount is suction cup to inside of windscreen. Easy to unclip from mount so don't need to remove mount from windscreen.
I did quick check of reception range by powering off gel cell. Hooked car up to caravan and placed camera transmitter in exact location I was going to mount it.
While it should be useful for reversing more important use is to see how many cars I'm holding up.