Cheap & nasty FSR handhelds. She talks. I listen. She is the boss. There is no confusion over left or right. Whose left. Whose right. The sides are referred to as port & starboard. no confusion. Simple hand signals get used too. No frantic jumping up & down waving arms like a chicken trying to fly. Simple pointing & signals that you might see on a construction site are enough.
A basic trick is to stand where she wants a rear corner of the trailer to stop.
I'm afraid that we are very boring to watch.