I have a 2H straight load Gore trailer with 2 escape doors. When trailering my mini, she can go under the chest bar and have access to the front space and both doors. With her curious nature and non stop grabbing and throwing things around, I fear for her opening the door with her lips and getting out. What do you suggest to keep her within the confines of the stall; I tie her and I have tried putting 2 bales of hay wedged in front of her, but she always pulls them down. Anyone have a suggestion? do they make a stall guard for minis in the trailer?