If you have a dealership that you're comfortable with I would speak to one of the service department writers there and have them run what is called an Oasis report. This report will give you a complete breakdown of the repairs on the truck that were performed at Ford dealerships. It's a great way to get an idea of how the truck ran, was maintained, and I believe it does show a change of owners. Oh yeah, this report is free.
Hope this helps.