Oh I wouldn't tie a horse to a trailer not hooked to a truck:). I saw a horse drag an unhooked trailer across my front yard one time. It was mine. The truck I use to pull the trailer, isn't getting used much now so I could just leave it out there hooked up all the time.
Becky
Just wanted to make sure everyone else knew that too. I know someone else who thought they could work on loading a horse without it being hooked to the truck too... and it tipped back as soon as the reluctant horse finally stood on it.