A foldable trailer that is attachable to a vehicle, particularly an ATV, for hauling a load. The trailer includes a hitch assembly for attachment to the vehicle, a first bed rotatably attached to the hitch assembly, and a second bed rotatably attached to the first bed by a unique hinge. The trailer may be tightly folded to, and carried by, the ATV so that the trailer can be brought through otherwise inaccessible terrain. Moreover, when in the folded position, a rear rail of the trailer may be opened to carry articles. When the trailer is deployed, the first bed is coplanar with the second bed to provide an enlarged area for holding articles. The hinge, joining the first bed to the second bed, allows the trailer to support a significant load.