Unfortunately wind noise around a door is not an unusual problem. Make sure the door is actually closing fully and that you can latch both locks. Sometimes a noisy door is caught on only one latch and is not up really tight. Sometimes the strike plate has to be adjusted as well. If you get it tight enough so it doesn't whistle in the wind, you may find you have to slam the door to close it.
You may also have a problem with the door seal rubber itself. It could be improperly installed or maybe have a tear in it somewhere.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC