Here is the Ship Manifest of Alien Passengers sailing from Hamburg to the United States, on 18 April 1925 on the ship Arabic. My Grandpa Rudolf is listed on line 22 as a 25 year-old farmer who last lived in Oehringen, son of Heinrich Laemmlen in Grossgartach. His destination was Red Wing.
Here is his passport from this trip, his first to America. You can read more about his adventures here: