I've bought a cheap reversing camera from ebay that should override the image on the radio screen using a suitable video adaptor cable.
Currently looking for a suitable place to mount it on the back of the van.
Going to have a momentary push button for viewing while driving, also comes on when using reverse gear.
(using a relay, so my push button doesn't bring on the reverse lights
)
I should have bought a camera with an adjustable mounting bracket. The one I got is built into a wedge shaped piece of plastic and can only be mounted on a horizontal surface, upside down, to give the correct view.
Ideally I would have liked it on the vertical rear door of the van. The angle of view is correct, but the camera would then be upside down.
Looking for a solution to this. The camera is pretty well glued into the wedge so I cant turn it around.