Are you saying you don’t have any keys for the door? If you have a key, take it to a locksmith/key shop. They can make one for you from your existing key. If you don’t have a key, and the trailer is unlocked, remove lock and take it to a locksmith. They may be able to rekey it for you. If trailer is locked and you don’t have a key, call a mobile locksmith. Last resort, break in.
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