Saw another horse trailer flying down the road with the horses heads sticking "way" out the window... Their heads were clear out over the center line of the narrow but busy highway. One little mis-que of either the hauler or an oncoming semi or travel trailer and those horses could well be toast.
I see several of these every year. At least when it gets cold they will run with the windows shut. This trailer had grills for the windows which were hanging down below the open window. It was not hot out.