... and then kick the residents out when they finally get zoning approval to redevelop for luxury housing: from politicians whose votes are surprisingly cheap (most elected municipal officials have ties to the real estate industry, or are themselves in the business).
This is happening right now, here in North Carolina. The worst part? Who do you think makes up the largest part of trailer park residents here? Yep. That's right. Separated or retired military veterans, retail workers and domestic servants. They don't need to watch Masterpiece Theater to experience the wealth inequality and exploitation of the Gilded Age: they're living it every day (although our popular culture won't allow them to question it).
Oh, and one more thing: although some elitist s.o.b.'s may disagree, trailer park people are no more unlikable that McMansion neighborhood residents. In fact, I usually find the former a lot more pleasant to deal with.