Using the DeWalt DWST08210 is easy. First, adjust the foldable brackets to fit your tool boxes. Then, place the tool boxes on the carrier and use the central locking mechanism to secure them firmly. When moving it, be aware of the weight limits. On stairs, make sure the total weight doesn't exceed 175lbs. For maintenance, keep the metal parts clean and dry to prevent rust. If the brackets or locking mechanism seem loose, check and tighten them regularly. With proper use and care, this tool box case carrier will serve you well for a long time.