164 each parallel column 460 462 of transverse rollers 164 contains seven transverse rollers 164 in fig1 a front end portion support assembly 476 consists of adjacent unconnected parallel columns 560 562 of transverse rollers 164 attached to the bottom 112 by screws 564 in fig1 a front end portion support assembly 576 consists of a single column 660 of transverse rollers 164 attached to the bottom 112 by screws 664 the single column 660 contains nine transverse rollers 164 to provide multiple rolling surfaces to contact the raised ridges 72 in the floor 70 of the pickup bed 54 so the front end portion 58 of the swing out tool chest 50 moves smoothly from the stowed position fig1 to the use position fig2 in fig1 a front end portion support assembly 676 consists of a single column 760 of transverse rollers 164 attached to the bottom 112 by screws 764 not shown the single column 760 contains nine transverse rollers 164 to provide multiple rolling surfaces to contact the raised ridges 72 in the floor 70 of the pickup bed 54 so the front end portion 58 of the swing out tool chest 50 moves smoothly from the stowed position fig1 to the use position fig2 a track member.