If you want your hoist to travel along a beam, then you need to mount it to a quality trolley. The most common type is a push trolley like those shown here from Magna Lifting Products. Each trolley is proof-tested to 150% of its rated load, and they are manufactured in an ISO 9001 facility. A load-equalizing design means the suspension distributes the load equally to all wheels. They are essentially maintenance free and even if the wheels fail completely, the trolley will not fall off the beam. These trolleys accommodate a wide variety of beams too, and no matter the width you mount them to, they roll easily because the wheels include durable ball bearings. The bodies are made from strong alloy steels, which rounds out the solid build quality of these units.