More than 18 months after the devastation of Hurricanes Katrina and Rita, thousands of low-income people remain in FEMA trailer parks. Social science research teaches us that clustering large numbers of vulnerable families in isolated, underserved communities is a recipe for disaster. Public policies should focus on providing meaningful, permanent housing choices in decent neighborhoods for the low-income families currently living in trailers. In addition, as long as some families remain in trailer communities, they need on-site services to counteract the damaging effects of isolation and distress.