I have a 12 yr horse I bought six months ago. He is definitely a work in progress. I went to put him in a different horse trailer (not a stock trailer) and he freaked out when I went to close the divider. He backed right out and had the fear of death in his eyes. I got him to calm down and started the process again, he’ll get in, but once I start to move the divider same thing happened. He has no issues in a stock trailer so I assume it has something to do with claustrophobia…?!  Any suggestions would be greatly appreciated. I’ll keep on trying. Thanks for all you do Richard~ Zak