A vehicle timber bank arrangement having a horizontal supporting beam (1) and generally vertical post assemblies (2, 4 and 3, 5) mounted at respective ends of the beam. Each post assembly includes a bottom post (2, 3) anchored firmly to the beam, and at least one top post (4, 5) which is displaceable telescopically to its associated bottom post. A pivotal upper connection means (15) is pivotally mounted at at least the first top post (4), and at the second top post (5) there is mounted a device (22) for coupling with the upper connection means when this device is in a position in which it connects or binds the two top posts. The upper connection means is swung by a piston-cylinder device (6, 7) which functions to displace the first top post telescopically in relation to the first bottom post. The first top post (4) and that part (7) of the piston-cylinder device (6, 7) which actuates the first top post are coupled together by means of a rack-and-pinion arrangement.