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IMO it depends on how much action is displayed in the movie. If there are a lot of dynamic scenes like car chases you’ll need a high rate while ‘simple’ dialog scenes can get away with way less.
That also means it depends on what movies you like to watch.
Torque.
But yeah a safety feature would be easy to implement. It could be a buzzer that goes off or a enforced max speed of like 10-20 mph as long as the trailer isn’t locked in the down position.