I got the same response from RV CAMS. I received a Voyager 7" wireless setup yesterday from them They have a killer price on this unit right now (overstock).
The only negative is that the instructions are REALLY minimal and I will probably need to talk to RV CAMS to get some wiring advice on the monitor. There are 7 or 8 electrical hookups that are well marked with meaningless terms to a novice. I know some have to do with the optional side cameras that the monitor will support and will not be needed this go-around.
I did get the dash apart and checked the wiring. I have 13.9 volts, so I am convinced it is the monitor and not a poor ground. I plan to plug the monitor whole with a piece of black melamine that I have in the shop, attaching it with the four existing screws. That should match the existing dash color pretty well. I will then mount the monitor on that. Have not figured that out yet. The standard mount is a huge windshield suction cup. I am trying to come up with some kind of clip so the monitor can be removed.
On the back, I am thinking about mounting the camera bracket on top of the existing camera housing. I can not put it inside because of the spike antenna that needs to stay vertical. I can then route the wires into the original housing to hide them and keep them dry. Since there is currently power to the existing camera, wiring in back should be a snap. I have not been up there yet, so I might run into unforeseen challenges.
I will keep you posted and possibly post pictures.