wear or failure of the layer 147 as a result of shearing during the sledding may be kept to a minimum continuing with reference to fig5 the sledding of the undercarriage 140 within the frame 150 may be controllably guided by the frame 150 itself that is in addition to a lower surface 503 over which the undercarriage 140 sleds the frame 150 includes sidewalls 502 and perhaps even upper lips 501 to help guide the sledding referring now to fig6 a perspective view of an embodiment of a track 600 is shown at the upper portion of the lift frame 150 in this view the frame 150 is depicted from its rear or u2018 pivot u2019 end opposite that shown in fig1 the track 600 is configured to provided added security to the trough 120 and its undercarriage 140 relative the lift frame 150 that is as the trough 120 and undercarriage 140 are sleddingly extended as depicted in fig2 c additional security and stability may be provided through the use of a track 600 in the embodiment shown the track 600 is incorporated into the frame 150 in a manner securing feet 130 which emerge from below the trough 120 as the noted sledding takes place thus sufficient security between the trough 120 and frame 150 is ensured indeed with added reference to fig3 the likelihood of the trough 120 accidentally rolling or prematurely dropping a tubular 110 at the rig floor 320 is substantially eliminated in one embodiment the depicted foot 130 may be slid rearward extending out of the page.