Quick dumb questions for a dumb idea.

RedFish said

Remember that these old cars are extremely simple to hot wire under the hood. Hot wire bypasses anything you might have done on the inside too.

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Very true. Like information systems, all you can really do is make it more of a pain in the A.. or risky than it's worth.

That said, you could go so far as to move wring around, and place "dummy" wires, decoys if you well.

Though like @Cope says above, a flat bed negates it all. That's bold though and not nearly as likely, unless someone keeps their pride and joy parked on the street.