Abstract: A collapsible trailer including a base, a shell hingedly secured to said base, wherein said shell engages with said base to form a sealed vessel when said trailer is in a closed position, a rear wall hingedly secured to said base, wherein said rear wall is entirely contained within said shell and said base when said trailer is in said closed position, a rear deck hingedly secured to said base, wherein said deck is entirely contained within said shell and said base when said trailer is in said closed position, a coupling means secured between said rear wall and said rear deck for transferring forces between said rear deck and said rear wall, and wherein said rear wall, said shell, and said base generally define a first room when said trailer is in said open position.