Reminds me of the old song by the Kingston Trio, that was titled "Tom Dooley"! It was about a man who knew he was going to die by hanging. Cow's know. They are raised knowing that their time on this earth is limited. It may be sad...but it's a big part of how America got it's start & how it feeds people & how those people continue to have jobs.
It appears that only people who use private horse trailers are paying top dollar to "pamper" their animals. Mostly show or rodeo people.
Most million dollar race horses are transported in huge 18 wheelers & the only air comes from opening the window vents & the heat is supplied by the body heat of the horses. The people who tend to the horses ride along inside the trailer right along with the animals. No one complains.
BTW...Cattle live outside in the elements, so I don't think they are suffereing from having an open air container. It is hard to see & even worse to have to drive behind & smell the stench of their feces & urine! Mooooove over.
The cattle MUST be packed in so that they are not thrown around & injured during shipping. They are difficult animals to tether, like a person could do with a horse! Basically, cows & cattle are wild animals. They can be herded, but it takes one-on-one handling to get them to take a harness & walk on a lead like a horse does. No one wants to "train" cattle by the thousands. It's called an INDUSTRY & it IS a bit inhumane, but until people stop eating meat...it's not going to change. Get over it (no desrespect intended). Perhaps someone will enact legislation to pamper the cattle & the price of beef & leather goods will skyrocket!
I have lived & worked in both industries.