650 is to much. I just put one on my wife's Honda and it was only a hair over 100.00 and works great.it was hard wired I don't know why you couldn't add another wire i'm also going to put one on my 27' T/T and hard wire it to my in dash Kenwood navigation system. Kenwood has a camera with a 30' cord that will get me to the hitch then another cord to the receiver then I can unplug at the hitch.I would like to try a wireless and use a repeater. I have one on my TPMS, but it works with or without so I don't know if its beneficial. I can unhook from the trailer and be 80' or so from it and they still work.
Jay D.