A source to a tabloid reports: "Tom is a car nut. He has practical everyday cars, classic collectibles and high-powered sports cars like the Porsche 911 Turbo."
As he likes cars and owns quite a few, he is probably "changing them out" a bit as the mood strikes him. Certainly he can afford to, and he appears to pursue his automotive likes more than the average person.
He recently had a number of his machines fitted out with bulletproof glass.