Actually, the DUKW before it was accepted into military service was used to rescue stranded sailors off Provincetown on 1 Dec 1942. Four days later they were used in a demonstration exercise in 10ft surf to ferry troops and equipment from ship to shore.
https://www.smithsonianmag.com/travel/odd-dukw-66979423/
Lots of room for operator error in very bad conditions. If the boat is sound that points to a mistake by driver. My method is nose to the wind with enough power to keep it there and try to ride it out. If I can get to a sheltered area fine. Never tried to run for it. So far it has worked but I ain’t discounting luck and the all mighty. I’ve also never had 30 other people on board.