A working equipment arranged to be mounted to a vehicle, the working equipment comprising: - a movable arm for loading and unloading a load carrying object, such as a container, to/from said vehicle, wherein the movable arm has a first end connected to said vehicle and a second end arranged to connect the movable arm to the load carrying object during the loading or unloading; - a lift frame assembly comprising a lift frame with an attachment part arranged to be attached to the second end of the movable arm, a pair of upper connectors mounted at opposite sides of an upper part of the lift frame, and a pair of lower connectors mounted at opposite sides of a lower part of the lift frame, wherein said pairs of upper and lower connectors (20, 24) are adapted to attach said upper and lower parts (22, 26) of the lift frame to a corresponding upper part and lower part, respectively, of the load carrying object; - an actuator system, arranged to operate movements of the working equipment; - a sensor system, arranged to monitor the movements of the working equipment, and - a control unit configured to generate control instructions to control the operation of the actuator system in response to a loading/unloading command for the loading and/or unloading of the load carrying object and sensor signals received from the sensor system, characterized in that the lift frame assembly comprises a set of actuators configured to change the positions of the upper connectors relative to the attachment part along parallel movement axes M close to the opposite sides of the lift frame, and parallel to a symmetry axis S of the lift frame, and that the control unit is further configured to generate instructions to control said set of actuators to change the positions of the upper connectors along the movement axes M during an attachment procedure for attaching said lift frame to said load carrying object in response of an attachment command, and sensor signals from the sensor system. - a movable arm for loading and unloading a load carrying object, such as a container, to/from said vehicle, wherein the movable arm has a first end connected to said vehicle and a second end arranged to connect the movable arm to the load carrying object during the loading or unloading; - a lift frame assembly comprising a lift frame with an attachment part arranged to be attached to the second end of the movable arm, a pair of upper connectors mounted at opposite sides of an upper part of the lift frame, and a pair of lower connectors mounted at opposite sides of a lower part of the lift frame, wherein said pairs of upper and lower connectors (20, 24) are adapted to attach said upper and lower parts (22, 26) of the lift frame to a corresponding upper part and lower part, respectively, of the load carrying object; - an actuator system, arranged to operate movements of the working equipment; - a sensor system, arranged to monitor the movements of the working equipment, and - a control unit configured to generate control instructions to control the operation of the actuator system in response to a loading/unloading command for the loading and/or unloading of the load carrying object and sensor signals received from the sensor system,