wheel 24 turns around an axle 18 integral with the front tip of the support 15 and the rear tip of this support 15 is provided with two cylindrical counterweights 19 and 20 a spindle 21 capable of being threaded through holes 22 in the vertical walls of the reinforcing casing 16 is integral with a hand grip 29 at its tip which grip extends outside the container a hole 23 in the support 15 can also be traversed by the spindle 21 when the spindle 21 passes through this hole 23 the wheel 24 is extended below the lower level of the wall 12 whereas one can lock the wheel in a concealed retracted position by causing the support 15 to tip upwards around the pivot 17 and engaging the spindle 21 in the holes 22 in abutment with the support 15 referring to fig2 through 6 the operation of the invention is as follows beginning from a loaded position the unloading is affected by firstly retracting the lower arm 6 with the longitudinal ram or jack located within the lower arm 6 of the handling arm assembly 4 as illustrated by fig2 and 3 the hook 13 disengages from the hook 14 while the container slides towards the rear after the two supports 15 have been manually locked in an outwards operating position ram 9 is then employed to swing the handling arm assembly 4 towards the rear as shown in fig4 and 5 the mechanical arrangement of arm 6 framework 8 and ram 9 are such that framework 8 steadily begins to raise after the force applied by ram 9 at a point on arm 6 is overhead the point of attachment between arm 6 and framework 8 this allows complete unloading of the container.