Not with someone I know. In the first place she objects to getting out, when she does she just flaps her arms around and I have no idea what she means. And always forgets that if she can't see me in the mirror, I can't see her. If I'm trying to fit over a small drain, she ducks down to see it and disappears from view, still gesticulating. Or goes around the back and disappears from view. If I can't see her, I stop for safety, and then she gets annoyed that I stopped when she could see fine (but she is lovely). So I use a camera.The best reversing system is having your partner get out of the MH and guide you into the space.
I have two. But if we are in high sun I often can't see the monitor for the sun on the screen, and also because one camera has too much contrast, and one is too grey so I have to set the contrast on the monitor in the middle which is not optimum for either. So I just choose the most visible. So it seems a good idea to get beepers which might work better.