We travelled home on the night before and while pretty lumpy (3 metre swells) was bearable. Friends travelled that night ended up with a damaged car. Apparently most damage was to those parked in the rear of the ship. They knew there would be a 6 metre swell. Bikes are lumped together but not in allocated areas. We were travelling home from WA after 11,000 kms and 5 weeks. I'll post some photos when I get a chance.