You'd do well to put the awning away when it gets windy and never leave the campground with the awning out. The straps won't hold if a strong gust hits it and they ultimately hinder extending and retracting the awning.
If the unit is not plugged into shore power and the battery switch is turned off, then nothing electrical on the trailer should work. If it does, you have current getting past the switch. Try disconnecting the negative terminal on the battery - everything should be dead.