A Texas Deed of Trust creates a lien on property to secure a Promissory Note. These are two documents needed for real estate loans and seller financing.This assignment allows the new lender to enforce the terms of the deed of trust, collect payments, and take action in case of default. This Deed of Trust, Assignment of Rents and Leases, Collateral Assignment of Property Agreements, Security Agreement and Fixture Filing How do I fill this out? Of Travis County, Texas. Send short form deed of trust and assignment of rents via email, link, or fax. You can also download it, export it or print it out. A deed of trust is similar to a mortgage, and like a mortgage, it may include an assignment of rents. Read the instructions thoroughly.