From what I have found, there are 2 main branches of the Pikers that came over from Germany in the mid-late 1800s. One group stayed in Indiana area, the other group went to Arkansas. They mostly live in Sercy, Arkansas.
My line stayed in Indiana, but I will forward your message to another researcher that may have more info on the Arkansas line.
You may try checking the Arkansas page on USGenWeb. You will probably have better luck there.
Best wishes on your search!! Linda Trimm Piker