Abstract: Cover systems for vehicles are disclosed. An exemplary vehicle cover comprises a first housing base and a second housing base for mounting on a vehicle, each housing base having at least one channel formed therein. A pulley system is mounted in the first and second housing bases, the pulley system operable to move a cable through the at least one channel formed in each housing base. At least one support bow is mounted on one end to the cable in the at least one channel of the first housing base and mounted on an opposite end to the cable in the at least one channel of the second housing base, the at least one support bow moving between a retracted position and a closed position over the vehicle in response to operation of the pulley system.

Abstract: This invention is directed to a bow end used for sliding bow covering systems which utilizes a solid trolley rail or trolley rail cables or cable or tubular track, trolley wheels and a trolley base having a bow support. The trolley rails or cables are attached to each side of any open top unit or the track is attached along the side. The trolley bow end rides on the trolley rail or in the track without touching the trailer. The important difference in this concept is that the roller wheels are located substantially below the horizontal line of the top of the trailer unit, this allows for side delivery of the contents of the trailer without allowing the contents to effect the trailer trolley rails or cable. Also an extension for storing the bows and tarp in the open position extends out either the front or back end, thus not interfering with the open top of the dump unit. The unit is designed for use with any open to dump box.