Aluminum horse trailers have their pros and cons. However, the pros outweigh the cons; as fuel economy is the best thing about aluminum trailers due to their lightweight panels. Looking at the cons side, an aluminum trailer would offer slightly less protection in the event of an accident as compared to the safety offered by a steel cabin. In addition, aluminum is rust-proof but is likely to corrode, if there is continuous spillage of horse urine and manure. Overall, aluminum qualifies for the horse trailer job.