You need to review the terms of the contract of the person who sold the home and the mobile home park. Usually, the contract state that anyone moving into the park must be approved by the park owner/operator. You may be able to require the new owner to move his home or resell it at his option. He can then sue the seller for damages because he was not informed of the contract.
All that is easy to say…it is another thing to implement. And of course, you need to seek counsel from a lawyer in your state that is knowledgeable in this area.