Wow, just....wow. If you can't teach a horse to lead or start them under saddle without something like this, then you have no business trying it in the first place. Way too easy to kill both horse and rider in something like that.
Always remember that feeling of looking at a big, open country over the ears of a good horse, seeing a new trail unwind ahead of you, and that ever-spectacular view from the top of the ridge!!! Follow my training blog: http://robertsontraining.blogspot.com/
and I was thinking, don't you have to be able to lead the horse and have it trust you to even get it in that thing? You have to already have the horse halfway taught what that stupid thing is supposed to teach them.