I am also looking for more information on Reimers from Rueckenau.
My family of interest is Heinrich Wilhelm Reimer (c.1865-c.1935). He married first to Elisabeth Regehr and then to Maria Siemens. Heinrich was a lay minister in the Rueckenau MB Church. His brother was Jacob Wilhelm Reimer (1860-1948), an itinerant minister in the MB Church. They lived as neighbors in Rueckenau. I know there were other Reimer families in Rueckenau, unsure if related.
Heinrich Wilhelm Reimer had a son David Reimer (1895-?) who immigrated to Canada who married Anna Koop (1900-). Also looking for more information on this family.