I have seen some people that shouldn't even be driving forward let alone backing up. I agree that the trick is to go slow and watch the very beck of the trailer for the proper movement AND understand which way to turn the steering. Stop and get out and look if you have to. My wife used to try to tell me which way to turn when backing into a site. After a few impatient moments I had to tell her to just tell me if I am going to hit something.... otherwise be quiet please. Things have been fine ever since.