This design was the riskiest by far, as I was not sure if the small vent holes would print accurately. For the hours I spent on this design, and some rework on my part, I was really hoping for the best. Well, when I opened the package, I was very satisfied with what I saw.
I haven't been able to find any current livestock trailer model currently available, or any decent model that was ever done in the past. So here it is:
53' Wilson Aluminum Spread Axle Livestock Trailer: