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Hello: You are correct, the rescission of the 10% rent concession would be considered a rent increase and therefore you are entitled to proper notice before the increase. Also and more importantly, the new owners cannot change the terms of the rent concession agreed by you and the previous owners. The rent concession agreement survives the sale of the mobile home park--the transfer of ownership.
As for your demand to see the sale documents, I am afraid that you are not legally entitled to see the documents. The terms of the sale are private and thus the new owners have no legal obligation to disclose the documents to you.
A contractual agreement such as a lease or rental agreement between a Landlord and Tenant survives the transfer of ownership. If you have a written agreement about the rent concession that does not have any expiration date, which is an addendum to your rental agreement, that contract survives the sale of the property. Only after the expiration of an agreement can the new owners negotiate new agreement with the Tenant.
As for the Judge reviewing the terms of the sale, the Judge cannot do that on your behalf.