[KenWittlief]

I don't see the problem. You can make movies (ie Hollywood) with anything you want in the film, if its part of the story, and as long as you are not misrepresenting anyones product (like filming an Apple computer but putting a Microsoft label on it and calling it a MS computer).

The 3D models you make are nothing more than an artists concept of the real thing, right?

The only recent case Ive heard of a trademark owner complaining over someones use of their trademark: some guy wrote a book about Hersey (the company) and put a photo of a Hersey bar (the wrapper) on the cover of the book.

The company complained because it gave the impression the book was officially endorsed by Hersey Inc.

For your animation, if Hollywood could film an object as part of a movie, you can 'cartoonist' the same object for your animation.