I'm not too sure about all the dates you mention, but there is room for serious questions about them. I assume that Adam IS buried in the Trollinger cemetery, but the memorial marker is NOT his headstone, nor is there a stone for his wife. It is believed by some that his father, Hans Michael (and maybe Eva) as well as his son Jacob Henry may be buried at the cemetery in Dublin, VA. I agree with your dates for Adam.
The earliest headstone in the Trollinger cemetery at Haw River is for Henry's son Jacob, the second earliest is for eight month old Angeline, a daughter of Joseph Trolinger. The third and fourth earliest headstones in the cemetery are for Henry and Mary Trolinger.
You bet Eva was one tough lady, as was Margaretha, Adam's wife. When Eva emigrated from Germany she did not leave eleven children. Five of their eleven children died before they were four years old. I know little of three of the remaining six. But Adam of course was already in Pennsylvania when she left. Gabriel (and his new bride) traveled with them on their voyage to the new world, arriving on the Rosanna, 26 Sept 1744. Their other child, Salome, also left later the same year for the new world with her husband and two children, but on the voyage their ship was plundered by pirates. They were held two months, and finally ransomed by England, and returned to Rotterdam. On their return, Salome and one child died.