For more information, contact customer service at 360.902.3770. Forms are available online at dol.wa.How do I fill this out? A title or Washington trailer bill of sale may be needed. Washington bill of sale forms record the details of a transaction between a seller and a buyer of personal property. Access bill of sale form templates and learn how to transfer ownership of vehicles, boats, firearms, and other high-value personal items in Washington. Select the right bill of sale wa version from the list and start editing it straight away! Learn how to sell a travel trailer in Texas with our comprehensive RV Bill of Sale guide. Get step-by-step instructions, key documents, and FAQs. Completing this form does not transfer the title or act as a Report of Sale.