Seconding this. I just shipped my OTTB who loads but it’s a bad traveler with Bob Hubbard from Lexington to Las Vegas Area. It was an air ride semi in the first week of July so I was REALLY worried about the heat.
He came off a little thin but was able to gain the water weight back in a few days. He also rolled whenever they stopped to unload a horse along the way which I thought was kinda odd. But, he was in the trailer for 48ish hours and for a 15.3hh horse the stall was pretty big. As they unloaded horses they shifted horses around in the semi to give them as much space as possible without unloading them. The last two horses were going all the way to CA and got to be in box stalls on their last leg because all the other horses were gone. I thought that was a nice thoughtful touch.
So to your point, I get it. But shipping in a semi with a professional team might be the best option. I’m sure they’ve had every type of problem loader but I’ve never seen a horse bulk at getting in to a semi yet.