Myth #11: Opposite and Opposing Carabiners used in conjunction establish a more secure connection.
Truth: This only applies to NON-LOCKING carabiners, which should not be used in applications requiring such safety. This should have become a non-issue in WWII when locking carabiners were invented. Instead, carabiner users have hung onto some of these old methods and think they apply to all carabiners. This is not so.
Proper positioning of two locking carabiners is via similar orientation, i.e.: both gates in same position, and are used for added strength or greater rope radius.