I think you may want to visit this website.....I found it very helpful. http://home.earthlink.net/~lkok/
I am a Garrison/Camp descendant. My great, great grandmother was Susannah Garrison (married Camp/married Brannon). From what I have read from several serious researchers, the Garrisons and the Camps go back a long ways side by side......they were sucessful farming families....and together they moved ever westward in search of land for their descendants to farm. Many of them intemarried and as they moved westward at each step of the way, some of them stayed behind, having found their "home".
Clinton county is still rich in Garrison and Camps descendents. Plug Garrison in the LDS search engine, too. If I am not mistaken, more infor can be found at the Dixon Smith websites. I don't have my research handy at this moment, or I'd look it up for you myself.