Attach the square tubing to each side of the drawer using self-tapping screws and adhesive. The drawer should suspend above the bed about an inch. Next, install T-screws and bolts. A row of 20 bearings should be spaced evenly along the length of each support beam with half the bearings resting on the top of the space for the steel tubing and half below it. Each bolt should fit through the center of your bearings. Place a nut between the bearing and the support beam, followed by the bearing and then another nut. Once all bearings are in place, insert the drawer. Finish off the build by cutting a sheet of plywood to cover the top of the assembly, which can be screwed in place if desired. You can even throw a pad or mattress on top for a camp on wheels.