my mother in law has a 2011 f-150 and hers is rated at 9500 lbs withe 5.4 but i believe that is a small increased over the past few years ratings
Not to be "that guy," but Ford switched to a 5.0 in 2011, so it's either pre-2011 or the engine is a 5.0.
sorry not a fan of ford trucks, and know nothing about them but what im told