Good pics guys. Yes, I think the tractors count. He was astride them (there's another one if I can find it). There's also a Model K partially in a shed to the right of the tractor too. I believe there are two K in the uncropped version.
This 1912 article and wire wheel ad describe Henry Ford owning a large Minerva:
When the Ford family travelled to England, this story surfaced in 1912 (Automobile Topics, Jan 1913). Seems the Fords purchased a Rolls Royce to tour in, and Ford advertising promoted the story he "try to buy a Ford - but they were all sold, for several months in advance."
"And so," he (Ford) said, "I decided to buy the next best car that was immediately available."
A cut from a RR publication describes Ford buying a later Silver Ghost in 1924, and that a representative from Rolls showed up for an annual check of the car. It appears Henry Ford may have owned two Silver Ghosts over the years, unless this is the 1912 Rolls years later, or mistakenly described.
And, a 1915 publication in which the author reports the Fords own, in addition to the Detroit Electric and Rolls Royce, an enclosed Cadillac.