does a dash cam exist that has a wireless backup camera?

Answer 1

Even if there are any, I wouldn't have one.

I prefer Wires All The Way!

Answer 2

There are dashcams with two cameras - one for the forward view and one for the back view. I just installed a Rexing V1LG... there are several others. The display is not very large... and the rearview cam is wired, not wireless.

Search using "dual camera dash cam" at amazon. Add "wireless" if it is that important.