Sorry if this is a duplication but I do not see this on the forum.
I am descended from William's son William Jr who married Mary Malone, through their son Jacob. I too have had very little luckfinding any information on William. I was not sure that the Thomas I find in the Scioto co records was a brother. I live in Virginia and I have found some Triggs families, but I have not been able to link with them. I notice the date on your message is about 1 1/2 years ago. Have you found anything new?