to store panels when they are not erected to provide side walls for the trailer bed the need for this cabinet is eliminated by my invention a 40 foot long trailer about 11 meters is not uncommon in present day freight hauling and such trailer has stake pockets 11 along its periphery usually spaced two feet apart the panels 12 are generally a little less than 4 feet about 1 2 meters long and their height is less than one half of the transverse width of the bed the panels may be formed of plywood and generally are about 1 2 34 12 7 millimeters thick although this may vary stakes 14 are adapted to have their lower end fit into a stake pocket these stakes are of metal and a frequently used cross section is that shown in fig4 such stakes have spaced back to back u shaped sections 14 1 each to receive the upright side marginal portion 12 1 of a panel 12 as seen in fig5 the u shaped sections 14 1 terminate before reaching the lower end of the stake 14 to leave a lower stake portion 14 2 that closely fits within a stake pocket 11 the lower margins of the u shaped sections 14 1 engage the upper surface of the bed to limit downward movement of the stake in a stake pocket in fig1 and 2 stakes 14 are engaged in every second stake pocket 11 so the panels 12 are a little less than 4 feet long the trailer bed comprises a pair of sturdy i beams which are laterally spaced and extend the full longitudinal length of the bed as shown in my said previous patent u s pat no 3 481 627 the upper flanges of the beams.