The words “trailer park” aren’t used in America any more — at least not in polite company. Manufactured housing is the preferred term for the snug and relatively inexpensive prefabricated spaces that represent “home sweet home” for the roughly 22 million Americans now living in them around the country. Many of us know only the stereotypes: rows of dilapidated white rectangles occupied by the poor and owned by grumpy landlords only a bit wealthier than their tenants. Low- cost