This Listing is for a Single Axle Aluminum Smooth Trailer Fender to outfit any type of trailer. You will notice from the picture, that this fender has one Radius Bended End and one 90 Degree End Bend. Typically this means that the 90 Degree Bend is the Side that will go towards the trailer. On a Cargo or Enclosed Trailer, this would mount directly to the side of the trailer with different types of hardware, depending upon the design of the trailer. This fender size is very common with 13" to 15" Trailer tires and will outfit nearly any brand of enclosed or cargo trailer.