Backing that trailer into a tight campsite..

I guess I am blessed to have had a father who started me early at 8 yo backing a short tongued trailer with a riding lawn mower. More than once I have watched tortured souls trying to back a trailer in and asked if I could help. When I got a yes I would ask if they minded letting me drive. Usually I have backed it in on the first try. If I can drive in forward then, I can back it in. One time the wife's GPS on her phone took us into a residential area and after driving in with a couple 90* turns we came to a dead end. My wife said "What now? " then I backed our 30' fifth wheel all the way out.