Ok. Let's think about this:
Rust is a chemical reaction between iron and oxygen. Corrosion is similar. They both result in loss of mass (after the metal gets transformed and flakes/breaks away).
Electroplating is the process of using electrical current to coat an electrically conductive object with a relatively thin layer of metal. (wikipedia)
I guess you COULD use the electroplating process to make sure that the frame (presumably what is being protected) collects material instead of losing it, however that would require a return path for the current. And because, as you mentioned, the car is on rubber, there would be no such path.
So my initial impression of this "rust prevention" device is that it is bogus.
Anyone have any experience or research to the contrary?
UPDATE: News article on the topic
UPDATE: Forum post (note the username of the guy that has the "device")
UPDATE: Seems that most pages I find are based out of Australia and New Zealand. Counteract Products
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