A Van or Dry Van trailer is an enclosed trailer generally used to keep freight out of the elements. These trailers can only be loaded from the rear, and are generally loaded from a loading dock. A curtain van is similar, but can be loaded from the side as well. There are more dry van trailers than any other trailer type, in the trucking industry today. The typical dry van is 53 ft in length. However, 48 ft and shorter trailers are also used.