so as to enable under surface 73 of tray 70 to slide therealong preferably strips 118 are made of teflon u2122 attention is now directed to fig5 a and 6b wherein an alternative preferred embodiment for track assembly 50 and guide assembly 100 is illustrated in this embodiment track assembly 50 is comprised of a pair of rods or bars 160 162 extending horizontally between cross supports 40 and 42 ends 164 of bars 160 162 are affixed to brackets 170 welded to cross support 40 extending from brackets 170 away from frame 20 are wheels 170a wheels 170a contact exterior surface 73 of tray 70 and hence further simplify movement of tray 70 into and out of frame 20 as illustrated in fig6 a and 6b guide assembly 100 is secured to exterior surface 81 of back 80 of tray 70 preferably guide assembly 100 includes a pair of guide members 102 104 attached to opposing ends 94 and 96 of back 80 each guide member 102 104 includes a body 106 having ends 108 and 110 ends 108 of bodies 106 are attached to back 80 by any means commonly employed in the art as illustrated nut and bolt assemblies 109 are used to affix ends 108 to back 80 wheels 112 are attached to ends 110 of guide members 102 and 104 and rotate about a horizontal axis guide members 102 and 104 are angled such that wheels 112 are positioned below the horizontal plane defmed by bottom.