Boy, there is no way I would do this! A hitch trailer, sure.....but
never unhitched.
Horses are incredibly strong..I have seen horses tied to an unhitched
trailer drag them 20 feet before the rope or halter finally breaks.
I would imagine if a horse panicked in an unhitched trailer, it
wouldn't be too difficult for him to tip it over...
I'm curious to see what everyone else has to say.....
tracy