I just browsed through a few on YouTube, most of them...ahem...could be improved, though there were some cool ones.
I am slightly disheartened that larp is synonymous with fantasy live combat, but as the art grows, that may change. There's more to comic books than super heroes, I know there's more to larp than fantasy (nothing wrong with fantasy, there's just a lot more out there--or should be).
As to trailers, I can probably cut something, given enough time and footage. But this isn't to become a habit.
Aaron