Transportation unit with truck tractor with removable platform interchangeable with another traction engine

The vehicle has a platform (4) fixed in a removable manner on a chassis (3) by fixing units. The chassis comprises transversal beams and four hydraulic landing gears (8) fixed at ends of the transversal beams. A hydraulic motor pump (7) and a crane (5) with an articulated arm (6) are mounted on the platform. The landing gears are extended to support on ground during loading-unloading operation. An independent claim is also included for a transport assembly.