It really depends on your definition of the word "animated" means, if you want a definite answer.
http://www.youtube.com/watch?v=6Gz8yGdr29s
Would require model animation and would have to be triggered in the script.
He wasn't asking if it's possible, he knows it's possible.He just wants it to be made.
This isn't necessarily a suggestion or request, but I was just curious as to if it is possible to make a vehicle with animated treads.