How do you get out if you don't have an escape door?
The point is, you don't get into the trailer in the first place. Arguably the SAFEST way to load the horse is to have the horse self-load
. If you don't have to get into the trailer in front of the horse, that is safer for the handler.
If you need to tie the horse, then you do so through a front window, after the back has been closed.
If you don't have a window on the trailer to access your horse .... well that would be a trailer I would never use or buy. I don't find it safe that I can't untie my horse quickly while they are in the trailer. IMO
I travel alone and do not have an escape door. I bring the horse in, tie her, then move the partition at the same time I'm backing and crawling under the partition. Horse can't back anywhere in a slant.
If the slant is not closed, sure, the horse can back up.
For those wondering how to get the horse to stay put while they close the back door --> training.
The horse doesn't unload until you ask them to.