My wife is great at assisting me in backing up. She has 4 commands (left, right, straight back, and stop) that I (we) understand. We also have an orange cone that I set up on ground where I want the driver's side rear corner to end up. Have her shine a light on the cone (or some object) and the rear corner of your RV. (Not in your eyes).
Don't back up if you can't see her. If I don't move, she will come to my window for a conversation.
This system does not always work. I also have a microphone at the rear of the MH where I can hear her voice… I don't always want to hear that.