I've experimented with a few wireless cameras. Currently, I'm using one from Tadi Brothers. Sitting still, the picture and reception are great. As soon as I start moving though, it tends to break up, and sometimes lose the signal altogether. I
We have a fairly short 5th wheel (Winnie 25RKS), yet I feel like I should hardwire it, or get an extension for the antenna.
I also have one from Yada that I use in my truck camper.