It sounds like you need to take your problems directly to the park owner. Many park owners put a manager in place so they don't have to deal with the day to day operations. They often have no idea if the person they are depending on is treating residents fairly or taking advantage of them. Let him/her know what is going on. If you don't the abuse will not doubt continue?
You have 2 different problems. Resolve one at a time do not mingle the two. As the rent seems to be a more pressing issue I would get that settled first. You don't want the landlord to feel your not paying rent because you are generally discontent.
Hold onto your receipts. Make copies. Give one set of copies to the owners. If you can’t contact the owner directly send then the receipts and a letter explaining your rent problem. Be sure to send it certified mail and request a return receipt, so you have proof that it was received. Include your phone number and request a direct conversation with the owner. You always want to appear to be on the side of reason so when you present your case stay calm and cool.
Once the money issues are settled it will be allot easier to negotiate your parking space privilege.
Do NOT pay any extra fees or charges over your agreed rent. Ask for your overpayments back or ask for a credit against future rent. California has a strong set of landlord tenant rules. The California Mobilehome Residency Law requires a park to give residents a 90-day advance written notice of a rent increase. Special fees can not be sprung on you, month to month.
Read he California Mobilehome Residency Law
You can also contact:
Golden State Manufactured-Home Owners League
11021 Magnolia Street
Garden Grove, CA 92841
Toll-free Phone: 1-800-888-1727
Phone: (714) 826-4071
CALIF. MOBILEHOME OWNERS RESOURCES AND ACTION ASSOCIATION
Post Office Box 7468
San Jose, California - 95150
Phone: (408) 244-8134
Manufactured Home Owners Network
80 Huntington Street, Number 266
Huntington Beach California 92648-5343
(800) 724-6644 & (Phone ID: 714.536.3850)
Good Luck !