The ATR seems to be a bit prone to unwanted tipping. A long fuselage, a tricycle-type gear and the main door in the rear is a nasty mixture when all the passengers storm to the exit for disembarkation. I have often seen a little strut inserted below the rear fuselage for ground operations, as seen here:
Also, the Ilyushin 62 showed this characteristic. For loading and unloading, a retractable tail strut was installed to keep the nose wheel down.
