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.