.The Playhouse gave the media a peek at the world-premiere show this week (it begins previews Feb. 15), and one of the revelations about the staging was its use of multiple versions of the Hoover family V-dub -- big ones, teeny ones, even one the Hoovers get to dangle their feet from, Flintstones-style.The van, you will recall, was an icon of the Oscar-winning 2006 movie about pint-sized pageant hop