what about this ferry boat ? ...
(https://www.sc4devotion.com/forums/proxy.php?request=http%3A%2F%2Fi120.photobucket.com%2Falbums%2Fo184%2Fvetram%2Fferry2.jpg&hash=7872c6a705346005ba66f3b95f877fb3f74bd6e4)
these are very popular in my country ( Greece) and they carry cars and passengers in small distances.. i do not think there are about the same in game's custom content
thanx