Katesrider, that is a sad story and totally understandable why that horse has issues loading.
On the flip side, let me share a story with you. Someone was hauling their pulling horses down the interstate when (and I'm not sure how) two of the four horses in the trailer fell out onto the highway. No one hit them (probably because light traffic being way up north), and they were not seriously injured, mostly scrapes and I'm sure bruises. A few drivers pulled over, and because they were halterless (halters were in the trailer broken probably from when they went out), were a little tricky to catch but not bad. Someone had the presence of mind to use their belt.
Believe it or not (I was stunned), these guys went right back into the trailer, no problem.
Some horses have had trailering incidents and seem to never recover, while others don't seem to blink an eye.
Be the kind of woman that when your feet hit the floor each morning the devil says, "Oh crap, she's up!".