Actually, the main differences between the "backup" and "observation" cameras are the resolution and frame rates - the observation cameras giving higher quality images. Depending on how they are wired, either can give full-time viewing.
That said, we've had a Furrion wireless observation system on our fifth wheel for about three years. I don't find it quite as useful when backing as having my wife back there with a two-way radio (though I do use the camera, as well). I do find it very useful, however, on the highway to know when I'm well clear of a semi I'm passing to pull back over safely. On travel days, my wife follows in a chase car (we're full-timers) and the camera system is handy to make sure she's still back there in traffic such as in town, etc.
The monitor for our Furrion system just died and I have a replacement system on the way. It's a newer, "upgraded" system with higher resolution and contrast and strong wireless signal. It also has a microphone in the camera and a speaker in the monitor... we'll see if that replaces the two-way radios. My wife is a pretty darn good spotter.
Our Grand Design came pre-wired and with a Furrion mount installed, so installation was a breeze (did it myself). I've wired it to the running lights so the camera is not on 24/7 but only comes on when I turn the running lights on in the truck (I always drive with lights on).
Rob
