I didn't think there would actually be a forum for Doblers, and now I see there are two entries!!
My grandfather, Christoph Friedrich Dobler,was born in Metzingen, Wurttemberg, Germany, around 1863.He had one living full brother, Johann Jakob Dobler, who was born June 16, 1865.There were several half brothers and sisters by their parents' previous marriages.
Fred's and Johann's parents were Christoph Friedrich Dobler and Philippine Rosine Vogtle.The elder Christoph was born in 1810 in the village of Birkmannsweiler, about 25 miles north of Metzingen and 15 miles northeast of Stuttgart.
If this ties in with your Wurttemberg family, please let me know.Perhaps you have other information.Nothing I have can directly connect with your Doblers, but since they come from the same general area, there could be a connection.