I have found information on two different types of track drive personnel lifts. The Teupen Spider Lift (Specifically the Leo 12G) http://www.spiderlifts.com/12g/index.html And the Niftylift (Specifically the TD34TN) http://www.niftylift.com/pdf/Track Drive US IS-03.pdf Has anyone used one of these? Does anyone know of a company or person who owns one of these? I would like to speak with people who have direct experience with this equipment. Thanks and have a great day.