TT pre-wired for camera - system is junk (maybe)

One thing to check on your pre-wire is whether your camera is always on. Someone warned about that in another post. He actually installed a switch inside his trailer to turn it off when not on the road. I hope your extension works. I've never had a decent experience with wireless. But I haven't tried in a while. I've wired both my trailer and my tow vehicle, so I don't have to worry about reception.