There are some posttribers whose understanding of the prophetic scriptures does not require a seven-year tribulation. Personally, as one who has been persuaded of the posttrib view for many years now, the primary thing about the posttrib view is that it finds no secret rapture (or a rapture separated by much time at all from the resurrection of the dead in Christ). The posttrib view sees the catching away of the saints and the resurrection of the righteous occurring as essentially one event, just as it is described in 1 Thess 4