Abstract: An apparatus mountable on a vehicle and having a mounting section and a lift section. The lift section is moveably coupled to the mounting section. A drive chain having a plurality of articulating links and defining opposite first and second ends is operably coupled with a drive gear. At least one of the drive gear and the first and second ends of the drive chain is coupled to the mounting section and at least another one of these items is coupled to the lift section. The rotation of the drive gear movingly drives the chain and thereby moves the lift section relative to the mounting section. In some embodiments, the ends of the drive chain are coupled to one of the mounting section and the lift section and the drive gear is mounted on the other one of the mounting section and the lift section.