I have a book of abstracts of wills of York County PA 1749-1819 and it lists:
Aug 14, 1793Oct 29 1795 Andrew Trimmer of Reading Township (PA). Executors: Anthony Deardorff and David Trimmer. Children: David, Matthew, William, Mary wife of Anthony Deardorff, Sophia wife of Jacob Brugh, Anna, Christiana wife of Jacob Picking, Eleanor, John, Andrew, and Sally wife of ? Aughinbrough. Grandchild: William Aughinbrough.
I think this man also had a brother named Peter Trimmer in the same Reading Township, York Co. PA.