How to submit this form: Submit this form along with required documents and applicable tax to the county tag office in the county where the primary purchaser. There is Form T-7 of a bill of sale that you can use in case of selling or buying a trailer in Georgia.How do I fill this out? 7 Bill of Sale (PDF, 164.91 KB). A Georgia trailer bill of sale form lists the elements of a transaction between a merchant and customer. Need to register a trailer in Georgia? You will need to present the MVR with a relevant Georgia trailer bill of sale. To make the sale process easier and ensure legal compliance, click the button below to fill out the form. Access Document Now. Outline. The signatures of the seller and the buyer are enough.