As in some other states, NM doesn't require a license plate on *every* horse/livestock trailer, so there may be no help there in IDing the reprehensible culprit.
One of the greatest cutting horse mares EVER, Poco Lena, was actually abandoned in a trailer along with another horse-a gelding, I think-many years ago. As I recall, some guy had been hired to drive them back to Texas(?),from a cutting in CA...and he got stopped along the way, got drunk in a bar, just left the horses. They were finally discovered after something like FOUR DAYS of standing in that trailer w/ no food or water. Don't remember what happened to the other horse; Poco Lena lived, but was SEVERELY foundered, and crippled by that almost beyond belief. I was ASTOUNDED that she was actually BRED twice after that, to Doc Bar, I believe, to produce two foals. I saw video of her and one of the foals, and couldn't BELIEVE that anyone would be so crass as to put the mare through carrying foals in the condition she was in...She was finally euthanized after the second one(both went on to become 'high-powered' cutting horses, I believe-which of course, is what the owner was after)...bottom line is, it's ALWAYS about the money, it seems. Nowadays, of course, embroyo transplants would be done--at LEAST saving a mare such as this fine campaigner the PAIN and SUFFERING of going through pregnancies in such a condition. To me, there is a SUPREME irony(and perhaps, some karma?) in the fact that it has now been discovered that a terrible malady, known as HERDA(you can look it up, re: Quarter Horses), seems to 'run' in some of the mare's line, apparently via her sire, Poco Bueno, and his, King P-234-and thusly, in some of the 'hottest' cutting horse lines. (Don't get me wrong; I rode and LOVE cutting horses, and think that today, the ONLY breeder I would go to to look for a QH would be a KNOWLEDGEABLE and EXPERIENCED cutting horse breeder, as they appear to me to be the only ones producing horses with the conformational features to be sound ATHLETES....)In any event, I would have LOVED to be the one to administer some 'justice' to the guy who left those two horses to endure such a horrific ordeal!! Hope those who did this will be caught and suitably punished, as well!
Margo