Wireless back up cameras haven't gotten very good comments in the past when used with TC's. Electronic stuff seems to improve all the time so who is having success with wireless these days?
We have used a wired system since our rig was new in 2005. It has been flawless. I would not be without it, we operate with it on constantly. It is wired to the reverse circuit, but can be manually turned on. We have to remember to turn it off as it's not wired on the key circuits.