On my previous truck, I used the Garmin wireless backup camera integrated with my GPS. It was ok, but didn't have great night vision. However, it was pretty easy to install. If I had to do it again, I'd get something integrated into the rear view mirror. It's really nice having the backup camera available at all times and not just when you want to hook up the trailer.
One thing to consider is that once you get whatever you are going to use, either paint a small white square or put white tape on your trailer tongue (if it's black) to make it easier to see in the camera. The low contrast of some backup cameras makes it difficult to differentiate the end of the tongue in low light. Having some contrast to aim for makes the job much, much easier.
I'm done. This isn't a place to be helpful. It's a place where curmudgeons with a superiority complex will nit pick everything. If you want help, go elsewhere. Admin, delete my account please.