I like the OPs idea of a cargo camera. I've been looking at the double DIN nav/DVD/stereos on eBay that have a rear view camera, and was wondering how you could link additional cameras? I also like the mirroring feature where you can project what's on your phone to your stereo.

I would also like to be able to view the cameras at any time.

So, in reviving this old thread, I have to ask... Did anyone do the cargo cam?