My mom's horse has issues trailer loading. We've been working with her for about 3 years now and she still only gets on the trailer when she wants too. She will pull back and rear if you try to pull on her halter to get her in the trailer. She has never had a bad trailering experience because when we first got her she walked right on. I've run out of ideas and I need help, we've tried professionals and they haven't gotten anywhere either.