Trailer trouble

Remy had his first ride in the trailer this morning. We were only going five minutes up the lane to a friends house, where we could unload him onto the grass area they have at the front of the house, let him chill and have a look around and then reload him and come home.
We've done all the preparation, but he was a little hesitant as I led him out onto the yard in his travelling boots. After a couple of attempts he went in and stood quietly while Jim put the back bar on and lifted the ramp.
I don't like travelling horses, never have, but when I was travelling my horse on a regular basis, I had a lorry and I could see my horse from the cab. I've never liked trailers, but here in France a trailer is the most practical option. So, as we set off, I was nervous. Remy's a pretty calm chap and I didn't expect anything spectacular, but even so......
He neighed a couple of times and could hear him pawing, Jim said he was fidgety, but nothing to worry about, or so we thought.
We arrived and I opened the jockey door to find the front part of the partition hanging off, resting on the floor at an angle and the  breast bar hanging from a warped bracket.  My heart was in my mouth, but thankfully, Remy was standing very quietly and calmly on the correct side of the partition exactly where he was supposed to be and was unharmed! I led him off the trailer and after a quick look around he put his head down to eat! No harm done, but I feel terrible. I'm sure that we checked everything, but something's gone wrong with the partition to come away like that. Poor boy, having to deal with all that the first time travelling!!
While I let Remy eat, Jim and Ricky removed the partition completely and then I reloaded him and travelled him back that way. He wasn't worried about going back in there and seemed more at ease with the bigger travelling space. I know a lot of people travel their horses in a trailer without the partition, and perhaps I will too, when (and if) I find the nerve to try again. LOL