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Most states require that homemade trailers over a certain weight must have a title. These laws and the application procedures can vary state by state. Contact your closest DMV to see what is required. You can find your closest DMV by entering your state or zip code here: https://www.dmv.org/dmv-office-finder.php.  In the US, you must apply for a Vehicle Identification number (VIN) when you register your vehicle. You will need to provide proof of identity. Some states will require an inspection. Some states require all trailers to be titled while others may not register trailers at all. Others will only require titles on vehicles above a certain weight. For example, in Texas, you do not need to title or register a trailer weighing under 4,000 pounds (1,800 kg). In New York, however, all homemade trailers need to be titled. Canadian provinces may base your titling requirements either on weight or number of axles. You will need to apply for a VIN through your local ministry of transport, and your car must undergo a safety inspection.  In Canada, each province has their own office, services, and websites for registering vehicles. Your best option is to call the same office where you registered your car or applied for your driver's license. For example, in British Columbia, you will register and insure your trailer through the Insurance Corporation of British Columbia. They will consider your trailer a “ubilt” vehicle. Go here for more information: http://www.icbc.com/vehicle-registration/specialty-vehicles/Pages/Ubilt-vehicles-and-trailers.aspx. Your trailer must fulfill a certain number of safety and construction standards. Processes for registering trailers can vary from state to state. Generally, you will need to have a state inspection, a completed application for licensing a vehicle, and proof of identity.  The general standards for homemade trailers can be found here: https://infrastructure.gov.au/roads/vehicle_regulation/bulletin/vsb1/index.aspx. The weight of your trailer will determine fees. A light vehicle is any trailer under 4,500 kilograms (9,900 lb). Heavy vehicles are over this weight. First, you will need to get a VIN by contacting the DVLA. Then, your trailer must undergo an Individual Vehicle Approval (IVA) inspection. Contact the DVLA via their website or call for more information. You can go here to find the forms and guidelines for trailers: https://www.gov.uk/government/publications/individual-vehicle-approval-iva-it.

Summary:
Contact your state’s department of motor vehicles (DMV) in the US. Ask your province’s Ministry of Transport in Canada. Check with your state’s department of transport in Australia. Contact the Driver & Vehicle Licensing Agency (DVLA) in the UK.