You can't take the Fisherman out of this Camper wrote:
When I had my fivers and the DW to help me back up she would not give me the right direction until she saw which way I should be turning TOO LATE into the turn. I started ignoring her directions and turning before she would tell me on the walkie talkie. That worked for a while until she noticed I was always turning before she would give me direction... which created some more 'unfriendly' dialogue!! She did not understand that I needed to get my initial direction well before she realized what I needed to do. I finally got her to agree to be a SPOTTER ONLY and not to distract me with unnecessary directions so I could make my own mistakes. Believe it or not... that's when I learned how to do it and nail it... after some more practice of course!!
Sounds very familiar
One other idea that I finally tried. Last time we took it out I had DW walk along side the drivers side wheels and put a paint spot on the driveway every 3 feet or so about a foot outside the wheels. When I went to back in I just backed along this natural trajectory. Worked like a charm. If you don't want the paint on your driveway use some sidewalk chalk and put empty drink cans on the spots.