How to remove a trailer hitch locking pin without the key?

To remove a trailer hitch locking pin without the key, you can try using a pair of bolt cutters to cut the pin if it's accessible. Alternatively, you can use a drill to bore out the lock cylinder if it's not too hard or thick. Be cautious, as these methods can damage the hitch or lock. If you're unsure, consulting a professional locksmith may be the best option.