Loading an aggressive pig into a stock trailer can be a difficult experience, particularly if your pigs are frightened and excitable. Handlers need to start early, work patiently, and remain calm and quiet. Give aggressive pigs plenty of time to get used to and explore the trailer.  If possible, park your trailer near their pen a few weeks before the loading date. Your pigs will probably be wary of trailer floors that are made from unfamiliar material. Try laying down some shavings or straw to make the floor more familiar. Some livestock trailers can be tilted down to the ground. This is a great way to make it easier for your pigs to step up. Finally, you should move your pigs in small groups whenever possible. Being with other pigs will make them calmer while working with a small group will make it easier for you to handle.