This trailer is from the documentary "Tent City U.S.A." which premiered Thursday night on the Oprah Winfrey Network. I don't know if it will run again at OWN (Check your local listings), but the network does sell their documentaries eventually on its website here.
Due primarily to the economic recession, a growing number of people are finding themselves in a position they never imagined: homeless. Tent City U.S.A. explores a community in Nashville, Tennessee of nearly 100 homeless people who live under a downtown bridge. They work to stay together after a devastating flood destroys their land and forces them to evacuate.
The New York Times reviewed the documentary this week, if you care to find out a little more about it.