To satisfy my own curiosity, I removed the narrow pannel in the cargo area that plugs the gap where the double decker cargo system is on other models. When I removed this pannel, I looked at the underside, and there is a little chart that shows when the pannel was produced. It lists 02, 03, 04, 05, and 06 down the left side, and the months across the top. Maybe this is an indication that Toyota only plans on keeping the 4th gen around for 1 or 2 more model years. That would be a bit shorter than previous gens, but it seems like everything is moving faster these days.