Steel frame, aluminum upper. Storage area with water tank in the gooseneck. Two 'human doors' on either side at the front. Full width, divider in the middle to divide trailer into a front and back. Full width door across the back makes for a nice wide opening for loading horses. Inside lights. Outside rings for tieing up horses. If you plan on ever sleeping in the gooseneck, add windows. If you plan on carrying large amounts of gear, add the appropriate pieces on the roof. Rubber mats on top of the oak floors. Protective heavy plastic half way up the inside walls. Removable windows on the sides and back.