Originally Posted by kitten_Val
I'd be very scared to do that frankly. If 2 horses decide to move there (say, one or both are beat by bee or decide to change the position for whatever reason) it'll be pretty bad balance-wise.
I don't like that idea either.
As for the OP - what's wrong with having someone close up the door behind as she did at the show? A lot of horses don't stay put once loaded and having the bar put up right away is just smart.
I think horses do like the freedom of a stock trailer open box to some extent but I think about myself in that environment. I'd like to have walls to lean into instead of bracing agains the turns. That would be more relaxing on a long haul. But loading into that space is scary for them if they don't travel a lot.