I have personaly served on RORO ships, and they are very seaworthy vessels, but yes they do have a few design flaws.
Europe is trying to phase out RORO vessel all together as they constitue a massive saftey issue, in a space of 10 years i can think of three such disasters on RORO ferrys.
Scandanavian star
Herald of free enterprise
Estonia
1987 to 1994 thats 7 years and these three accident took place.
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