first frame rail 106 from the top 138 of each of the pair of vertical frame rails 136 each of the horizontal pivot members 144 comprise a horizontal pivot hole 146 located on each of the horizontal pivot members 144 distal to the vertical frame rails 136 the vertical frame 134 may further comprise a pair of horizontal swing arms 154 approximately configured in the same dimensions as the horizontal pivot members 144 that are located approximately adjacent to and in line with an outside edge 148 of the horizontal pivot members 144 each of the pair of horizontal swing arms 154 are moveably connected to one of the horizontal pivot members 144 via a mechanical fastener pin bearing or the like at the horizontal pivot holes 146 each of the pair of vertical pivot members 150 extends approximately vertically up from the top 138 of the pair of frame rails 136 each of the pair of vertical pivot members 150 comprises a vertical pivot hole 152 distal to the vertical frame rails 136 as illustrated in fig4 the cradle assembly 158 comprises a cradle beam member 160 and a plurality of skid board posts 164 the cradle assembly 158 may be detachable from the base assembly 102 the cradle beam member 160 is aligned approximately parallel with the first frame rail 106 of the base frame 104 the plurality of skid board posts 164 are attached to the cradle beam member 160 and extend approximately perpendicularly upward the cradle assembly 158 further comprises a center support arm 172.