There is also a Manufactured Housing / Oregon State Tenants Association (MH/OSTA), also with loads of useful information. Double-wowsers!
Mobile home park disputes can also involve contract, criminal, public and personal records, estate, contractor, land use, local, and many other Oregon legal subjects.
Oregon landlord-tenant resources may be of some limited use – note that mobile home laws are different from Oregon landlord-tenant laws so expect a referral rather than an answer to your specific mobile or manufactured home question.
Last, if you need a lawyer, the Oregon State Bar has a lawyer referral service.