It's actually far worse than that. Trailer park Millionaires is a report from 9 years ago following wealthy investors who were buying up trailer parks so they could Jack up rent. Investors specifically targeted sex offenders, convicted felons, and other desparate tennants, so they could mercilessly exploit them since they truly had no place else to go.
The investors were also trained to exploit families, since more members in the household means more potential workers, and that means they'll be more likely to tolerate a rent hike.