immigration/ship crew list

Hi Borge, I spoke to you a few months ago. I have found what I think is my hubby's gt grandfather's immigration info on the EllisIsland site. I have his name as Conrad Ole Hansen born 11-1895 in or around Bergen area of Norway. I show a male immigrant in 1917 arriving 12-25-1917 in USA on the ship Bergensfjord and departing in the port Kristiania, Akershus, Norway. I have a 1920 census showing him with his wife and infant daughter in the 1920 Iowa census. I am not sure how long he lived in NewYork area before moving to Iowa. I was told by his son in law(my hubbys grandfather) that he jumped ship in NY so he could bypass the EllisIsland process. I think he was a crewman and that is why he could blend in and do this. I show his ssc# and death info as having him born in NY but he was not. He was 100% Norweigen immigrant. How can I find out more info on him since I don't have his farm name in Norway, etc., or his family names? I can only track him to 1920 Iowa census as a primary source so far? I hope someone has advise that won't cost me a fortune to docs. Lisa in CA Lisa