Example: Your horse refuses to enter the trailer. Work him in circles then send him into the trailer. If he refuses keep him going. When he finally gets in let him stand and relax. Praise him and give him lots of loves! Then take him out walk him around the try to load again. If he doesn't then send him in circles again.
That was just an example but you can probably get what I mean. Lol! And keep in mind ~Its Never The Horses Fault!~ Something has been done to the horse, or the horse hasn't been worked with. Horses by nature are very trying animals and in the right condition will do anything for you if you treat them right! Good Luck! And its all about patience!