I fitted my reverse camera and a 2nd camera so i can see in the back of the van when transporting my dogs around.
I got one of those monitors that go on the original windscreen mounted mirror.
(not such a good photo)
The rear view camera has markers which display on the monitor to give me some guidance, each line actually works out as 2 foot gap. The monitor switches over when the van gets put into reverse, the default camera is the one that displays the load area.
Here's a view of the load area where the dogs go,
I have 2 x 12v flourescent tubes to fit yet to light up the load area.
(got to look after the dogs, they are my babies)
I positioned the camera just above the number plate, i didn't want the flush fit camera that requires the rear door drilling with a hole saw so i went for a different camera which i mounted between the number plate lights and used the grommet already there to route the cables.
(just been out to check van rear bumper as the pic above looks like there is a scuff on the bumper edge, phew !! its just the way the light shines on the paint)
cheers
Andy.