Financing is different, and easier, if the mobile is on its own land than if it is on leased land in a park. The age of the trailer does make a difference and it can be difficult to get a loan for mobiles older than 20 years. However, if older than 20 years, you might take a land loan.
Two good local banks that finance mobile homes in the Kennebunk area are Bangor Savings Bank and Sanford Institution for Savings. Feel free to email me if you have more questions.
I have the names and numbers of folks at Mainely Mobile and Saco Valley Credit Union and now I believe Kennebunk Savings Banks is also doing some of this financing. I'd be happy to put you in touch where you can get pre-approved and have your questions answered. The specifics of the property and mobile will also make a difference.
Feel free to contact me at: CJ Dubois-Cote, Prudential Prime Properties, 207-615-1663 or firstname.lastname@example.org