transporting a horse that "does not trailer well"

Another vote for doing at least one dry run before the big day. If it turns out that your rig is not going to work at least you can line up something different. You can also figure out - if you don’t know - what 'bad shipper" really means. Does he scramble on left turns if you’re going over 10 mph? or does he explode and try to kill himself? Big, big difference.