This caught my eye on the Northern Ireland news: a lorry that broke through a stern door of the ferry plying between Stranraer and Larne. Apparently, the artic had broken loose and rammed through the ferry's stern doors. The hole was 30 feet above the waterline, and the ship was quickly made secure. Two hours into its voyage to Northern Ireland, the Stena Voyager returned to Scotland. However, because of the presence of the lorry, docking was impossible. Passengers remained on board overnight, until they were safely removed by emergency services, who then went about the busines of removing the offending lorry.
I do not want to think what would happen if this happens on the MV Isle of Lewis. Its loading ramp is rather lower down above the waterline, and bearing in mind the average conditions in the Minch - no, don't think about it.