You might want to check to see if your Loyalist ancestors filed any claims against the US government after the Revolutionary War. Many Loyalists lost property, goods, homes, etc., when they left. There was a method set up after the War to file claims for restitution. Never can tell what you may find but any claims could show exactly where your ancestors lived, worked, etc.
On one my many trips to the Archives, I did manage to find a Revolutionary War pension claim from the children of a collateral relative. Turns out this relative had briefly served at Fort Stanwix in Rome, NY. The Fort was originally built during the French & Indian War. I moved to Rome back in 2000, not having known any of that. There's a reconstructed fort on the site of the original. The Fort was abandoned in 1768, but reoccupied by Colonial troops in 1776. My relative was sent there with a group of other militia men that summer to strengthen the Fort. I'm not sure if my relative was still there at the time of the Battle of Oriskany and the Siege of Fort Stanwix in August of 1777.