Gehrls from Germany to America 1880..

Hello to all; I am searching for the ships name and the date of arival of the Gehrls family in 1880, from Germany. My GGGrandfather, Hans Gehrls, born 24 Jul 1831, Germany, wife Sophie (Torber) Gehrls born <1831>, and family, also with him was my GGrandfather Friedrich (Fred) Gehrls. They lived in Mecklenburg-Schwerin, Germany. Ship may have been from the Hamburg-America Line. The port of departure may have been Hamburg, Germany, and port was New York. They had arrived in the USA in 1880. They moved to Warren, Minnesota, USA. If you don't have any info., tell me how I can find their information. Thank You, Rodney