Just like a tank, a crawler is a crane mounted on an undercarriage with a set of tracks (also called crawlers) that provide stability and mobility. These are great cranes for long term rental use. Crawler cranes range in lifting capacity from 20 to 4,000 US tons. For maximum lift and reach, these cranes can be configured with a luffing jib and extra counterweights to lift huge loads. The main advantage of crawlers is that they can move around on site and perform each lift with little set-up, since the crane is stable on its crawler tracks with no outriggers. In addition, a crawler crane is capable of traveling with a load. Crawlers are typically very heavy and must be disassembled and moved by trucks, rail cars or ships to its next location.