Abstract: A multi-purpose utility vehicle which includes a self-propelled mobile, articulated vehicle having a cab on the chassis providing an enclosed and protected areas for an operator with a telescoping boom assembly pivotally mounted on the chassis for continuous movement through an arc of 360.degree.. The vehicle mounts a lift platform mechanism disposed forwardly of the telescopic boom assembly. The vehicle includes a telescoping, generally pantograph outrigger assembly to provide a lateral support to the rear and/or front end of the vehicle. In addition, the present invention contemplates a novel steering system which comprises multi-steering functions including automatic front wheel steering only; automatic rear wheel steering only, automatic front and rear wheel steering; and front and rear wheel steering for turning through 90.degree. in the same direction.