My hubby contracts with a company that does manufacturing and they use different kinds of stands, lifts and platforms because the products they manufacture are sometimes up to 30 feet tall.  He was told to find a hoist that would allow them to lift and hold cross members in place while they are welded.  I found a site for a Hoist Manufacturer that has been in business for 20 years and have all kinds of material handling equipment called Shuttlelift. So I saved him work! He owes me big time!