Different horse trailers offer various hauling capacities, from one to 16 horses. The number of horses that fit inside a horse trailer depends on the capacity of that particular trailer.
Horse owners who frequent horse shows may need to haul many horses at once, which necessitates not only a large horse trailer but also a vehicle capable of towing the horses and trailer. One horse weighs from 900 to 1,500 pounds, so owners who haul more than two horses must invest in large, heavy tow vehicles for their trailers. By contrast, owners of one- or two-horse trailers often haul the trailers and horses with standard pickup trucks.