Placing an RV at a trailer park. Where to begin? Is it even possible?

My brother and I are trying to help an family friend with housing. She's currently staying in an efficiency with no AC and the place is just gross. He has a friend who has an RV that they don't need and they are willing to pretty much give it towards a good cause. We however don't have a place to put it and I'm wondering if trailer parks would allow for someone to put an RV and just pay them a monthly fee for renting the land. She's currently in Northwest Miami dade. Ideally it would have to be close to there.