My wife does an excellent job of backing me in. I too have been to parks where someone wants to guide me in. I ask them if they use FMCA signals. If they don’t, I take time to instruct them. Also tell tell them the first time I see an arm going in a circle I stop and my wife takes over. Never really had a problem and I’ve taught lots of people about the FMCA signals. If someone doesn’t know them I highly recommend they check them out. Very easy and very simple to understand and to follow.