Rear view camera when towing

I have not personally had experience of a wireless camera ,but friends of ours had one for the same reasons as you,but have since fitted a hardwired camera as they found the wireless one very suceptable to interferance,

is it not illegal to have a screen showing when driving, as my dashcam turns the screen of after 30 secs so as not a distraction. thats why revesing cameras only come on when reversing.

No, it is only illegal to watch a televised broadcast or DVD signal when driving. I think you will find that the screensaver on your dash cam is a user option in the set up menu.

Google this topic and you will find many threads and various web sites. If you go wireless don't buy the cheap Bluetooth ones from eBay as they are prone to interference. 

Try these sites

https://www.parkingcameras.com/store/digital-wireless-rear-view-reversing-camera-kits.html?gclid=CjwKCAjw9e3YBRBcEiwAzjCJup8pJE5XpMXWtnSqt9uPNwIqZ2Co9q1fDkHxgcCwSn6N56ac65P6BBoCrdkQAvD_BwE

http://www.reversingcamerasuk.com/reversing-camera-systems.html?gclid=CjwKCAjw9e3YBRBcEiwAzjCJunnFrEd7m4r4Jgf28kFOuvH1EwD1zsuxyLGhFPORN9hBY0rDjW1iLBoC3w8QAvD_BwE

Our reversing camera is a hard wired and factory fitted one ,wouldn’t be without it ,always on when towing out car on a-frame.like has been said I fear a wireless one would be temperamental but I maybe wrong.

Brian & Jo