Trailer brakes
If your trailer is equipped with a braking system, make sure it conforms to the country's regulations, and that it is properly installed and it is operating correctly.
If your trailer weighs more than the maximum trailer weight without trailer brakes loaded, then it needs its own brakes, and those trailer brakes must be adequate. Be sure to read and follow the instructions for the trailer brakes so that you will be able to install, adjust, and maintain them properly.
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Do not tap into your vehicle's brake system.
Do not use a trailer with its own brakes unless you are absolutely certain that you have properly set up the brake system. This is not a task for amateurs. Use an experienced, competent trailer shop for this work.