To register a trailer in Georgia, fill out Form T-23 Homemade Trailer Affidavit and have it notarized. A County agent will also provide you with a Form T-22C and a serial plate. This serial plate must be riveted permanently to the trailer, and a Georgia Law Enforcement Officer must sign Form T-22C confirming it. Additionally, return the completed Form T-22C, along with a $12.00 license plate charge and any relevant Ad Valorem tax, to your County Tag Office.