Over the years I have watched my husband back nearly everything perfectly... then we got a 5th wheel. Yikes! I have no idea but it seems like when he uses his mirrors he puts it right in. When he turns and looks another way, well neighbors get out their lawn chairs to watch the show. My job is only to make sure he is not going to hit anything and watch for children. Otherwise I keep my mouth shut until he asks if it is OK. Then I tell him (GOAL) - get out and look... but I always say it nicely, well not always nicely. Once in a while while watching him I will say, "What are you doing?". That is not a good idea.