210 has a substantially horizontal distal surface 234 that engages the locking surface at the proximal end 211 of the stanchion as it is unfolded into a locked operative position fig3 shows how the pivoting hinge 230 and the stanchion 210 are assembled and how the locking surfaces of each component mate as a preferred embodiment unfolds the term u201c pivot shaft u201d refers herein to a substantially cylindrical shaped shaft 240 that is rotationally coupled to a pivoting hinge 230 and physically coupled to any structure capable of supporting the hoist 770 901 and load when the hoist is in use fig6 shows how the pivot shaft in one embodiment is passed through the pivoting hinge to form a rotationally coupled union between both components fig7 shows a plurality of open cylinders 770 that can be engaged by a cylindrical shaped open shaft and a cylindrical shaped pivot shaft 240 equipped with a pivoting hinge positioning nut 902 and adaptively coupled to one of the cylinders 770 that can be rotationally coupled directly to the pivoting hinge 230 the cylindrical shaped pivot shaft 240 can also be welded or mechanically coupled to the trailer in this example without engaging one of the open cylinders 770 the term u201c boom u201d refers to a lifting arm 260 that.