This is such a quandary! I hate to have thick shipping boots on when traveling to summer shows. Plus my horse ALWAYS poops on the trailer, so whatever she’s wearing is gooped all around the bottom of the hind boots. I always wonder if my horse will feel clumsier in shipping boots since they all step/walk awkwardly. Maybe the overall best option is bell boots all around and front/rear brushing boots?
I did have a gelding go down in a 2-horse trailer years ago after we had to brake hard to avoid a car that cut in front of us. No boots of any kind and he didn’t have a mark on him. But if he had hurt his legs struggling, I’m sure I’d be in the “bubble wrap from head to toe” club!