If you ever have to hobble your horse, or need a system to tie when there are no safe options, this is the system for you! It's actually really more safe than many options that most of us use all the time. I have personally seen, touched, and got to inspect every inch of this system and everything possible has been tested and implemented. Click on the link below to go to the website. Just tell them notjusthorses sent you!
Lazy Liz's Horse Picket System is the answer.