is communicated to the first side 17 of the base members 12 fixing their respective positions on the support surface they contact additionally the width of the lower positioned ledges 21 which are proximate to the first side 17 is slightly larger than the width of the second horizontal crossmembers 15 such as 1 1 times the width of the second horizontal crossmember 15 this close contact allows for a sliding engagement of one end of the second crossmember 15 through the formed ledge 21 but prevents twisting under load which helps stabilize the formed device 10 the formed ledges 21 have an open side forming them more like a slot this is intentional in that it prevents any contact with the top surface of the second horizontal cross member 15 during use this allows all of the force of the load to communicate from the edge of the second side 19 of the base member 12 or the formed passage 13 adjacent thereto to the upper surface of the engaged first horizontal member 14 which during experimenting was found to yield enhanced stability the adjustable crossbar bracket 16 shown in fig3 includes the first axial passage 21 and an adjacent and perpendicular second axial passage 23 the dimensions length and width of the first axial passage 21 are configured for.