How do you get a Trailer certificate of origin on a used trailer without a title?

Create your own home made trailer "Certificate of Origin". Title it "Certificate of Origin" include on it typical title and registrations details: Empty Weight (Obtain Certified Ticket of weight from a local CAT Scale establishment), Gross Vehicle weight (Usually 3500 LBS per Standard Axel), Under make or Model use "Homemade" as the type. Below the information type an AFFIDAVIT that you manufactured the trailer from owned recycled or scrape materials for your own use to road worthy standards. Deliver this Certificate with your "certified" Empty weight Certificate to your local DMV Registration office endorsed. Most State accept this but few may require a certification from a local service dealer of working lights etc... You can find a Certified Scale at most Truck Stops or Scrap Yards. Good Luck.