Not always, speed racer. The door glass in front entry RVs is usually not rectangular and will have a top and a bottom, so they cannot be turned over.
Mid entry doors generally are symmetrical and can be turned over as suggested. However, there are as many different ways of manufacturing an entry door as there are RV manufacturers, so what works for one may not apply to another.
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