I've actually witnessed this while tehy were backing one up and hit the brakes too hard and brought the nose gear a couple of feet up off of the ground.... Always heard it can happen but never had seen it before the eyes of the pilot/co-pilot were as wide as I have ever sen on anyone.......... Funny but an oh shit moment lol.......... The cargo ramp will always be down during the backup so that it won't sit on the tail like this one has............