Skeletal trailer, also known as a skeleton trailer or skeletal semi trailer, is a specialized type of freight trailer characterized by its open-frame design that resembles a "skeleton." Unlike enclosed box trailers or flatbeds, skeletal trailers feature a minimal framework structure that provides support for specific types of cargo while leaving most of the load exposed.

These 40ft skeletal trailers are primarily designed to transport heavy or oversized loads that wouldn't fit within standard enclosed trailers or that require special loading/unloading considerations. The skeletal design offers several advantages for particular shipping needs while presenting some limitations for general freight applications.