Collapsible trailers have wide-ranging applications across industries where storage efficiency and transport versatility are essential. This team of senior engineering students was tasked with designing and manufacturing a trailer capable of expanding and collapsing in width. The design incorporates a reliable suspension system for stability and a brake light system compatible with towing vehicles to ensure safety and compliance. The final deliverable is a full-sized, road-legal prototype that maintains structural integrity while reducing its width for improved storage and functionality.