DETROIT — Sales of sport utility vehicles took a dive in September, dragging down U.S. automakers who were already expecting payback after a summer of employee-pricing discounts. Asian brands, which didn't offer employee discounts, felt less pain. Several automakers reported strong car sales Monday, but SUVs took a hit industrywide in the U.S. market as gas prices skyrocketed following Hurricane Katrina (search). The Buick Rainier, Ford Explorer, Ford Expedition, Toyota Sequoia and Nissan Armada all saw their sales fall by 18 percent or more.