Abstract: An example of an apparatus is provided. The apparatus includes a first track to mount on a container along a first side of the container opening. The apparatus further includes a second track to mount on the container along a second side of the container opening. The first side is opposite the second side. In addition, the apparatus includes a frame engaged with the first track and the second track. The frame is to move along the first track and the second track between an open position and a closed position. The apparatus also includes a first panel to mounted on the frame to cover a first portion of the container opening. The apparatus further includes a second panel to mounted on the frame to cover a second portion of the container opening. The first panel is to overlap the second panel by a distance.

Abstract: Gravel boxes, open top containers with rolling roofs, and related methods. The rolling roof is used to cover open top containers for dry or liquid loads. The rolling roof may be manually operated with a ratcheting handle or motor in combination with two rolling mechanisms placed on each side of the roof. The rolling roof mechanism may be implemented by sliding the roof either to the left or to the right side of the container, and turning it from a horizontal position to a vertical position along the side wall. Such allows loading from either side of the container by using the full area of the opening.