The Rockhold family married into the Campbell family in Republic County. This family had members from Campbell - Rockhold - Tuthill - MacKenzie - Englund.
You might want to e-mail Jane Maddy at ljmaddy@parod.com
Jane is my cousin and the great granddaughter of Charles Campbell and James G. Tuthill, founding fathers of Republic County.
She has been most helpful to numerous people and I am sure will be glad to furnish information if she has it. If not, she might have an idea of who you could contact.
Good Luck!