Abstract: A track system for use with a cover positionable over a space, which includes a first and second track positioned proximate the space. The first and second tracks each include a slot extending the length of the track, and is configured for slidably receiving an outside edge of the cover. The track system includes first and second trolleys each having a slide for positioning in and configured for movement in their corresponding slot. Each trolley having support means for contact with a support surface to support the corresponding trolley. The support means is configured to facilitate movement of the trolley relative to a corresponding track. The track system also includes a leading edge support for connection to and between both trolleys, and is configured to have a leading edge of the cover attached thereto.