This is what I have from your local historian, Daniel Bly, on this topic, and if it fits into what you are describing, I very much hope you will add your research to what we presenty have:
"Daniel Bly letter to L. Ellingham [e-mail, Dec 2001], an extract: ‘… Andreas was in what is now Shenandoah County as early as 1762 when we find him taking over the land settled by Jacob Ammon on Funks Mill Run (now Tumbling Run).Ammon and wife Elizabeth deeded their tract of land in exchange fora promise to take care of them in their lifetime.It is almost certain that Dressler's wife, Maria was a daughter of the Ammons.In the Strasburg Lutheran Church records we also find that in a communion list from 1775, old Mrs. Elizabetha Dorothea Ammon is called "Felkner's mother-in-law" — Henry Felkner was an elder in the Church and so I guess she got a little extra note added after her name — so Rosina Felkner, Henry's wife, was a sister to Maria, wife of Andreas Dressler.Eventually David Dressler (also appears as Tressler) sold the 90 acre tract to my ancestor John Hamman about 1816 and it eventually wound up in possession of Hamman's son-in-law, William Bly — my great-great grandfather.Hamman, William Bly and other family members are buried in a cemetery on the hill above the old home place — until recently the old stone chimney was still standing.There are some unidentified graves in this graveyard, marked only by field stones — I am sure they are the graves of the earliest owners, the Ammons and Dresslers.’; “Pennsylvania German Pioneers” Vol. I (1727-1775), p. 31: ‘Palatines imported in the “Thistle of Glasgow”, arriving Philadelphia (Qualified: 29 Aug 1730), Jacob Ammon’ [used initial “H” as signature] — an ‘Adam Ammon [?]’ is listed as a passenger arriving aboard the “Duke of Wirtenberg” [16-X-1751, who may or may not be a relation of Jacob Ammon’s; “PA German Folklore Society” Vol. X  ‘Adolf Gerber Lists’ p. 133: ‘Ammon, Johann Georg — Sternfels 917430 Wf: Rosina. Ch: (1) Christian b. 8-25-1741. The family perhaps did not move into the village until shortly before the son’s birth, since the Ludwigsburg Protocol 4-30-1743 describes Hans Jerg Ammann as the father of 6 children // Hans Geo. Ament (Hans Gerg Amon), age 38, (with Ernest Amon), St. Andrew, Oct 7, 1743, Hinke I, 349-350, 3PA, 17, 856: George Amend, Donegal Tp., Lancaster Co., 1782’"