Your email add. has probably changed and this may be a waste of time BUT you asked about the following:
John Barrier -wife Susannah Trucks d/o George Trucks
Susannah Trucks was the widow of George Trucks and married John Berrier after George death in 1767.
But Susannah died in Fredrick county, Maryland and since John Berrier would have been fairly old then, I dont think its likely he relocated before his death.
Im related to the Trucks family. Dont know if this info helped or not??