I have a pickup. One for hitching up the boat, one for mounting on the camper to watch the boat when launching. Because the camper over-hangs the bumper, that cam for just pulling boat won't work. I definetly need two. One for the truck liscence plate, one for the back of the camper.

 

How do I get the D2 to see two cameras?

One to the backup connects the other to the AV in.

 

Or you could buy a swith. But then you would have to throw the switch to change views.