Abstract: A mobile service trailer having structural support columns extending vertically from a trailer platform and roof support members which are supported by the support columns and span the width of the trailer platform. A first guide track is suspended underneath and extends between the roof support members. A first crane is positioned on an elongated trolley which travels along the first guide track between an extended position and a retracted position. In the extended position, the trolley extends past the rear end of the trailer platform in a cantilever fashion to enable the first crane to reach and lift an object positioned behind the trailer platform. In the retracted positioned, the trolley is retracted to enable the first crane to deposit the object onto the trailer platform.