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 are adapted to attach said upper and lower parts 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 are adapted to attach said upper and lower parts 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 , <EOS>