Trailer design involves creating the exterior and interior layout of a trailer, which can be used for various purposes such as transporting goods, serving as a mobile home, or providing a space for recreational activities. Key elements include the size, shape, and materials used, which must be chosen based on the trailer's intended use and the weight it needs to carry. Additionally, effective trailer design considers aerodynamics, stability, and safety features. Designers often incorporate elements like axles, hitches, and braking systems to ensure the trailer is easy to tow and safe on the road. Proper design can enhance functionality and improve the overall user experience.