Radio trailer research

For my radio trailer I have been trying to do some research and trying to find other films that have radio trailers. From what I can find there aren't many, I found one for the new Fast and Furious 5 and one for a Romantic Comedy but from what I've heard I think I should manage to create one without many examples to base it on.

There are three ways I could create my radio trailer:

1. Using mostly extracts from my film to build up the plot line with an introduction of the film name.
2. Using peoples comments on the film to take up the reel time with a short explanation of the film
3. An introduction to the film with talk of it being an award winner and a 'must see'