My wife and I have been backing boats and trailers together for 40 plus years. The longer ones are easier and the hitch doesn't matter. Years ago, bride got tired of me not being satisfied with where she had me stop or that we were too far left or right.
Since then she does all the backing and I direct her as to where I think it should be when we are finished. If she can't see me or questions my thoughts she just stops and waits until we talk.
For us it works good and she is a very good driver. Yes, I can do it by myself, but we camp and travel for fun together and its part of the adventure.