Determine the type of trailer you need. For instance, you can design an enclosed trailer for hauling motorcycles, livestock or other cargo. You can also design an enclosed trailer that serves purposes such as a concessions area or a mobile classroom.
Review the colors/materials that are available, such as white, black or aluminum. Also, determine the size, including the height, width and length, that you would like your trailer to be.
Pick a hitch type, such as bumper pull, gooseneck or fifth wheel. The hitch should support between 10 and 14 percent of the gross weight of the trailer and its cargo. Therefore, heavier cargo will require a gooseneck or fifth-wheel hitch.
Use the weight of the cargo to determine how many axels the trailer needs. According to Dexter Axle, the axles can carry up to 90 percent of the loaded weight, so you need to select them accordingly.
Use an interactive, online program to design other materials and options for your enclosed trailer. Sites such as Millennium Trailers and the Aluminum Trailer Company offer online programs at no cost. This allows you to choose the type of exterior and interior materials used. Look at a company's brochures and catalogs and talk to a salesperson to choose your materials if no online program is available for the company from which you are buying your trailer.
