My DW and I both get out and look together. Then I tell her exactly what I want to do. I tell her what she is responsible for watching and at what point I want the tail end at so she can tell me to start turning. If anything she is more careful than I am. She's always asking me to come back and take a look to make sure she understood what I wanted.
We made a pact years ago when we bought our first RV, that we would never argue or get frustrated with each other when we were parking the RV. We are always joking and laughing while we park. I may get frustrated with how uneven the lot is but I always give her a pat on the butt and let her know she is doing a great job. The looks and comments we get from other campers is precious. We always tell them about our pact and our hope is maybe we helped keep the divorce rate down a little. haha