What am I missing?

While I am a newbie to mobile home parks, I have been reading the forums to get up to speed. As i reviewed the listings in reasonable proximity to my home (St. Louis), a few really jumped out at me. I am a believer in the old saying of “if it seems to good to be true, it probably is”. What am I missing on these listings? They appear to be good sized, city utilities, tremendous cash flow and all at a very low price.

http://www.mobilehomeparkstore.com/mobile-home-parks/12776-36-space-mobile-home-park-for-sale-in-carrollton-il

http://www.mobilehomeparkstore.com/mobile-home-parks/13062-30-space-mobile-home-park-for-sale-in-velma-ok

http://www.mobilehomeparkstore.com/mobile-home-parks/16259-missouri-mobile-home-park-for-sale-in-viburnum-mo