A chattel mortgage usually has a higher interest rate than a traditional mortgage. The document outlines the process for pulling out, safekeeping, disposing, and applying proceeds from chattel mortgages. 2.To record it through the mail, send the original document to the Bexar County Clerk's Office in the Courthouse. When a borrower takes out a loan to purchase a real estate property, they agree to pay the lender back for the loan through this document.