I have a lot of questions it seems...

While searching for roof vents I came upon an Exiss trailer accident where the trailer slid on it's side.  I've often thought that my open livestock sides wouldn't be as safe as an enclosed trailer in an accident.  My horses wear a fly mask when traveling so but does anyone know of something that could slide into the tracks where the horses head is positioned so their ears and noses won't in theory go past the edge of the trailer at any point.

Goofy question...I know.