Please include a per diem amount in the statement. The Vehicle Payoff Sample Letter form is a crucial document for individuals aiming to transfer their vehicle loan to the State Department Federal Credit Union.Create a Loan Payoff Letter online and download it as a PDF or Word document. Customize and print a blank Loan Payoff Letter for free. If you are looking to payoff your vehicle, there is a sample letter form that you can use as a guide. The letter should be professional and informative. Creating a payoff letter is essential to any loan or mortgage repayment process. Our free templates and this guide can help you get started. Creating a payoff letter is essential to any loan or mortgage repayment process. Our free templates and this guide can help you get started.