Ask a landlord-tenant lawyer and get answers ASAP
Hello and welcome! My name is ***** ***** I am a licensed attorney who will try my very best to help with your situation or get you to someone who can. There may be a slight delay in my responses as I research statutes or ordinances and type out an answer or reply,but rest assured, I am working on your question.
Have you contacted the local Code Enforcement or Housing Inspector or Health Dept regarding the conditions?
What is it that you would like to have happen here?
I apologize for the delay... had to step out of office for a bit..
Your fastest recourse is to contact the local Code Enforcement office or Health Dept about the open sewage as these are health hazards as well as code violations. They can cite the park owner for any violations and force them to make repairs. If they are bad enough then they may have to put you up in a hotel at their expense until repairs are made if the unit is deemed uninhabitable by the inspectors.
As for an extra key, that would be on you to pay to just have a duplicate made at a local hardware store for a couple dollars..
With regard to any retroactive reduction in rent, you would likely be entitled to one considering the conditions you have been forced to endure.. So take lots of photos of the conditions and then you can file a lawsuit in small claims court and seek damages in the form of a retroactive rent reduction. You are paying rent for a habitable decent dwelling that meets all local code and safety laws and you aren't getting that. A judge can award a nice judgment to set an example and deter future similar conduct.
As an aside, in addition to being an attorney, I have also been a landlord for over 26 years...