To import the box truck, go to the blend ITSBoxTruck2010 and click on it, go to collection and select the ITS Box Truck '10 that includes the whole box truck as a group into your scene.

In the scene, you can use the controller rig to move (located at the middle of the truck) and rotate the truck around and you can use the steering rig to rotate the front wheels on the Z axis (located at the front of the truck).