available from performance pipe plano tex maskill robbins of houston tex or forrester supply of green bay wis as shown best in fig8 and 9 the bearings 102 are generally upwardly concave providing one or more struts or cleats 106 extending away from the bearing 102 to prevent the bearings 102 from slipping off the foundation 108 while the weight of the pipeline 20 is gradually transferred from the wheel assembly 22 to the ditch 18 as shown in fig3 after passage of the wheel 36 a suitable foundation 108 is placed on the bottom of the ditch 18 to receive the bearings 102 in many instances the foundation 108 may simply be bags 110 of sand or other particulate material in some situations the foundations 108 may need to be sturdier or more elaborate depending on the slope of the ditch 18 and the available material in the bottom of the ditch after construction of the foundation 108 the bearing 102 is slid into place in any suitable manner as by first laying the bearing 102 on top of the pipeline 20 as shown in fig3 and then sliding it downwardly under the pipeline 20 when the wheeled assembly 22 moves away from the last installed foundation 108 an important feature of this invention is lubricating the bearings 102 with a liquid lubricant thereby promoting sliding movement between the bearings 102 and the pipeline 20 and minimizing tipping or movement of the bearings 102 relative to the ditch 18 to this end a suitable lubricant such as dyna blue available from american polywater corporation.