1949 Liner 22′ #4003

Rather a unique Liner with a unique layout: a back bath, but what is really odd is the serial number: 4003, which no one really is sure is what model that means. We know at least there are are 2 others, possibly more. Maybe it was used to ID a specific Liner layouts? Plan is to leave it here in the 22′ Liner world (1NNN) until someone can provide additional information on this trailer(s).