I suspect that I am related to the Tröster family of Holzelfingen that you describe in your posting.
My gg-gm was Catharina Frederika Tröster, b. 12 Oct 1818, Holzelfingen; m. 17 Jul 1838, Würtingen, to Johannes Brendle; d. 2 Nov 1896, Würtingen. Catharina Frederika Tröster's parents were Johann Friedrich Tröster (28 Mar 1788-8 Oct 1818; Holzelfingen) & Rosina Margaretha Hermann (19 Jan 1793, Hzl-------??). Johann Friedrich Tröster's parents were Johan Clemens Tröster & Anna Catharina Stoos.