I would certainly be happy to exchange information. It is my wife and daughter and her father who are the Koppenhoefer descendants. They are also Nabinger descendants through Anna Maria Mueller who was married to Johann Jacob Koppenhoefer. They and their children immigrated to Syracuse separately about 1865 and 1866.
My father-in-law is interested in what reasons or what the conditions were in Frankenstein at that time which might have caused the family to emigrate to the United States. Perhaps you know more about the history there to be able to say. His great-grandfather, Daniel Koppenhafer, was in Rhine Pfalze Verein in Syracuse. Daniel was not quite 18 years old when he arrived in America.