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Some areas require more forms than others, so it is a good idea to call your DMV or local transport authorities first. Most forms can be found online on their website or picked up from their office. Some forms you may be required to fill out include:  Application for Title and Registration of a Vehicle Sales tax exemption Proof of ownership Application for a VIN A special form for homemade trailers You will usually apply in person in the US, Australia, and Canada. Make copies before bringing them to the DMV or transport office. Check with your local office to see what you need to bring with you. In general, you may need:  Your driver’s license The weight slip of the trailer Bills of materials used to make the trailer The notarized description of the trailer Proof of car and trailer insurance Completed applications and forms A proof of address, including a driver’s license, payroll stub, utility bill, or voter registration card Fill out form IVA1t with a Declaration of Amateur Built. Scan and upload the necessary documents to the Technical Application System on this website: https://www.gov.uk/apply-vehicle-approval. Fees can vary widely between different areas. You may need to pay for the VIN plate, title, registration, and taxes. Some areas may have special fees applicable only to homemade trailers. You can usually pay by credit or debit card.  Typically, trailer registration fees are between $20-40 USD. Plate fees may be anywhere from $20-200. These fees can vary based on the weight of the trailer and the state of registration. Once you have submitted your application, it may take between 2-4 weeks for you to receive your documents in the mail. If you were given temporary documents, you can usually use your trailer, as long as you carry the documents with you. Once you receive your plate, screw it onto the back of your trailer.

Summary:
Fill out the proper forms required by your local government. Take the application and other necessary documents to apply in person. Submit copies of your documents online to the DVLA in the UK. Pay the registration fees. Wait for your plate and title in the mail.