I'm being glib, of course, but that's because there is no rational point to be made here. There are almost zero barriers to entry to businesses that provide goods and services to poor people. Buying a trailer park requires extremely little capital investment. Thus, there is no reason to believe that the pricing is predatory. Instead, the article is trading entirely on the ickiness (some) people feel about running a business catering to poor people.
I think limited housing options for poor people is a big problem. But it's not a problem created by business owners providing housing to poor people (or ones evicting poor people who cannot pay). It's a problem created by state and municipal governments that make it illegal to build dense housing, housing on small lots, housing that isn't to code, etc.