How to Use Truck Tool Boxes? Trailer tool boxes can be used after mounting and attaching them to the back or underside of your truck. Use truck storage boxes to store the equipment you use to secure your loads, including tarps and winch straps. You can also store repair kits, spare parts, and any other tool or piece of equipment you might need on the road. Depending on the size of the in-bed tool box you choose, you can hold a variety of tools and supplies to keep handy within your cab; this includes supplies that do not connect directly to trucking! Food, hygiene, gloves, clothes, any variety of items tied to your health and wellness can be stored safely in your cab, separate from your work supplies.