Vertex Mobile Crane with the necessary equipment to travel at speed on public roads, and on rough terrain at the job site using all-wheel and crab steering. This crane is mounted on an undercarriage with four rubber tires that is designed for pick- and-carry operations and for off-road and "rough terrain" applications. Outriggers are used to level and stabilize the crane for hoisting. In a rough terrain crane, the engine is usually mounted in the undercarriage rather than in the upper, as with crawler crane. Most models have 4-wheel drive and 4 wheel steering which allows them to traverse tighter and slicker terrain than a standard truck crane with less site prep.