Equispirit Horse Trailers. EquiSpirit Horse Trailers. For Sale. For Sale, 2016 3-horse, EquiSpirit Safeload trailer. It’s hard to find a used three-horse design that allows you to unload any one horse without unloading the other. It has all the EquiSpirit safety features including the full height doors with ramp, 8 windows in the rear stalls, unload ramp in the front stall, telescoping divider, 6 turn signals with one on each fender, and a removable box stall conversion to make two box stalls.