Have you ever reached for a tool in your truck bed, only to find it buried under a pile of gear or sliding around in the dark? A tonneau cover keeps your cargo safe and dry, but it also creates a hidden challenge: how do you organize your equipment in that tight, low-clearance space? Many truck owners struggle to find a storage solution that fits perfectly without sacrificing the sleek look of their truck or wasting precious bed space.
Choosing the right toolbox for under a tonneau cover is not just about size. You have to balance durability, security, and easy access while working around the specific rails and supports of your cover. It is frustrating to buy a box only to realize it blocks your cover from closing or limits what you can haul. Because every truck setup is unique, finding the “perfect fit” often feels like a guessing game that costs you time and money.
In this guide, we take the guesswork out of your search. You will learn about the best types of storage boxes designed specifically for low-profile setups and what features you must look for before you buy. We will break down the pros and cons of different materials and mounting styles so you can get organized once and for all. Let’s dive into the best options to help you maximize your truck’s utility and keep your gear ready for action.
Top Tool Box For Under Tonneau Cover Recommendations
- TONNEAU-COMPATIBLE. This under tonneau cover tool box measures 16-1/2 inches high and has an offset lid to conveniently fit under most truck bed tonneau covers and maintain full functionality
- RIGIDCORE LID. This under tonneau tool box is built for maximum lid strength and security with patented RigidCore technology. The lid is filled with a solid foam that maximizes structural integrity and helps prevent binding
- EXTRA-THICK ALUMINUM. UWS aluminum truck tool boxes for under tonneau cover are constructed with thicker aluminum compared to most aluminum tool boxes to provide superior strength. This matte black truck tool box features a one-piece tub
- SECURE LOCK HANDLES. This under tonneau cover tool box is equipped with easy-to-operate, dual-locking twist handles that can be locked on either side of the truck. The handles are wide-spread for easier access from the sides of the truck
- EASY TO INSTALL. UWS pickup truck tool boxes are available in several different sizes and styles to accommodate each unique truck and preference
- EXPANDED STORAGE | This versatile storage box can be used as a mounted toolbox, cooler, or container. Its functional design allows for placement anywhere along the truck bed. The elevated mounting system allows for the use of the entire truck bed floor
- Made in the USA with Global Materials
- STRONG & SECURE | The durable construction of this storage box allows it to hold up to 200 lbs of cargo. A lock and key mechanism on top of the toolbox paired with a truck bed cover installed above it ensures that your valuables stay safe
- EASY CLAMP INSTALLATION | This truck bed box is compatible with most full-sized trucks. For most models, the box clamps to the bed’s side rails underneath your truck bed cover.
- WE'VE GOT YOU COVERED | TonneauMate is backed by a 2-year, no hassle guarantee. We are committed to providing you the best service at all times. Simply call our team. All TruXedo products are proudly made in the USA with globally sourced materials
- Lightweight & Rust-Proof Aluminum Storage - Forwode aluminum truck bed tool box is crafted from diamond plate with a powder-coated finish for rust-proof durability and lighter weight. 48x15x15 inch truck tool storage box offers ample organized space for all your tools—perfect for full-size truck beds, pickup boxes, and more. Our truck tool box combines rugged strength with long-lasting corrosion resistance.
- Effortless One-Handed Opening & Foldable Handles - Equipped with a premium integrated gas strut, our truck tool box opens smoothly with one hand and stays securely in place. The dampened action prevents slamming, protecting the lid and objects in truck tool box. Foldable side handles provide a comfortable grip for easy lifting and installation. Whether for your trailer, pickup or outdoor, these features save you time and hassle.
- Secure Locking System with 2 Keys - Built with an internal lock mechanism and two keys, our locking truck tool box deters theft for your valuable contents. The tight-latch design of tool box for truck keeps the lid securely closed, preventing accidental opening even on bumpy roads. Enhanced anti-pry protection keeps your truck tool chest safe on the road or at home.
- Weather-Resistant Overlapping Lid - The overlapping lid for truck bed tool box creates a tight seal that sheds water and resists weather, keeping your stored items dry and protected. Your tools and gear stay in top condition, whether used as a truck storage box or standalone unit.
- Fits Truck, RV, Trailer & More—One Box Does It All - FORWODE versatile truck bed tool box mounts easily on pickup trucks, RVs, trailers, and ATVs—functioning as a dependable truck tool box. Our tool storage box also doubles as a rugged garage or workshop organizer. Choose from multiple sizes to fit A-frame brackets, shelving, or your exact bed width. Plus, we back it with responsive customer support.
- TONNEAU-COMPATIBLE. This under tonneau cover tool box measures 16-1/2 inches high and has an offset lid to conveniently fit under most truck bed tonneau covers and maintain full functionality
- RIGIDCORE LID. This under tonneau tool box is built for maximum lid strength and security with patented RigidCore technology. The lid is filled with a solid foam that maximizes structural integrity and helps prevent binding
- EXTRA-THICK ALUMINUM. UWS aluminum truck tool boxes for under tonneau cover are constructed with thicker aluminum compared to most aluminum tool boxes to provide superior strength. This aluminum truck tool box features a one-piece tub
- SECURE LOCK HANDLES. This under tonneau cover tool box is equipped with easy-to-operate, dual-locking twist handles that can be locked on either side of the truck. The handles are wide-spread for easier access from the sides of the truck
- EASY TO INSTALL. UWS pickup truck tool boxes are available in several different sizes and styles to accommodate each unique truck and preference
- Mounts in the Truck Bed for Lockable Storage
- The drawer is 60" length and the Drawer Extecns 54" for storing Longer Items with Slides rated at 600 lbs.
- Heavy-Duty 16 Gauge Steel Construction with Texture Black Powder Coat
- Comes with Five Plastic Partitions to Divide different Length Items
- Drilling required for Installation with included Hardware
- MAXIMIZE STORAGE CAPACITY – Store large tools with the 30-gallon storage capacity.
- QUICK-ACCESS LID – Reach tools quickly with the half-lid top that allows access to contents without removing stacked VERSASTACK units or opening the chest lid.
- IP54 RATED* – Help keep internal contents safe and dry in challenging conditions with dust and waterIP54 RATED* – Help keep internal contents safe and dry in challenging conditions with dust and water resistance (both chest lid and half-lid). resistance (both chest lid and half-lid).
- USEFUL WORKSTATION – Stack VERSASTACK boxes on top in one of two directions, for a convenient workstation that helps maximize accessibility on the jobsite. TSTAK modules
- ONE-HANDED OPERATION – Easily open the tool chest, even when your hands are full, with the QUICK-ACCESS LID
- Versatile Fit: Designed to fit underneath most tonneaus/roll-ups, ensuring compatibility with various truck bed covers
- Lockable Side Toolbox: Equipped with lockable latches, this DuHa "Humpstor" enhances security, protecting your valuables from potential theft and the elements
- Multi-functional Dividers: Includes dividers that serve both as organizers and gun racks, meeting legal requirements as a gun case in most states
- Space Optimization: Provides practical in-bed storage without compromising valuable floor space, enhancing the functionality of your truck bed
- Made in USA: Proudly roto-molded and made in the USA, the DuHa Side Toolbox "Humpstor" comes with a limited lifetime warranty, reflecting the manufacturer’s confidence in its quality and durability
- Truck Box: Perfect solution to keep your valuable gear, clothing, tools, and even dry food organized, secured, and protected on your roof rack, in your truck bed, or stored in your SUV
- Use As: Truck Box, Truck Tool Box, Outdoor Box, Storage Box, Gear Box, Field Box, Cargo Box
- Features: Extreme durability, weather resistant and dustproof, heavy duty lay-flat handles, tie-down plates, mounting kit interface plate, limited lifetime guarantee (case only)
- Dimensions (LxWxD) - Exterior 41.00" x 17.25" x 16.00" - Interior 36.80" x 12.25" x 13.20" - Weight Empty 28.70 lbs
- Secure Mounting: Designed to securely mount in your truck bed using the Pelican Cargo Cross-Bed Mount (sold separately)
The Ultimate Buying Guide: Choosing an Under-Tonneau Toolbox
Adding a toolbox under your tonneau cover is a smart move. It keeps your gear safe, dry, and organized. Because your truck bed is already covered, you need a box that fits perfectly without hitting the rails. Follow this guide to pick the best one for your truck.
Key Features to Look For
When shopping, focus on how the box fits your life. First, look for a “swing-out” design. These boxes attach to the side of the bed and swing out over the tailgate. They make it easy to reach your tools without climbing into the truck. Second, check for a locking mechanism. A good lock keeps your expensive tools away from thieves. Finally, ensure the box is weather-sealed. Even with a tonneau cover, moisture can get inside. A rubber gasket around the lid keeps your tools dry.
Important Materials
Most high-quality toolboxes use one of two materials:
- High-Density Polyethylene (HDPE): This is a tough, hard plastic. It is lightweight, won’t rust, and handles extreme temperatures well.
- Aluminum: Aluminum is very strong and looks sleek. It is heavier than plastic but offers more security against forced entry.
Factors That Improve or Reduce Quality
Quality comes down to how the box is built. A high-quality box has a strong hinge system that won’t sag over time. It should also have a quick-release bracket. This allows you to remove the box if you need the full space of your truck bed.
Low-quality boxes often have weak plastic latches. These break easily in the cold. Also, avoid boxes that lack a mounting bracket. If the box just sits on the floor, it will slide around and damage your truck bed paint.
User Experience and Use Cases
Think about what you carry. If you are a contractor, you need a large, deep box for power tools. If you are a weekend camper, a smaller box is perfect for jumper cables, tie-downs, and first-aid kits.
Most users love the “swing-out” style. It turns a dead corner of your truck bed into a useful storage area. It keeps the center of your bed open for large items like plywood or camping coolers.
10 Frequently Asked Questions
Q: Will this box fit under any tonneau cover?
A: Most under-tonneau boxes fit under soft and hard covers. However, always measure the height of your bed rails before you buy.
Q: Can I install this box by myself?
A: Yes. Most kits come with all the hardware you need. You usually only need a basic drill and a wrench to finish the job.
Q: Does the box interfere with the tailgate?
A: No. Well-designed boxes are shaped to clear the tailgate when you close it.
Q: Is the box waterproof?
A: Most are water-resistant. They keep rain and dust out, but they are not meant to be submerged in water.
Q: Can I remove the box quickly?
A: Yes. Most models feature a simple pin or latch system that lets you lift the box off the mounting bracket in seconds.
Q: Do I have to drill holes in my truck?
A: Some models require small holes for the mounting bracket. Others use existing factory holes in the truck bed.
Q: Will the box block my LED bed lights?
A: It depends on the placement. Check the dimensions of the box against where your lights are mounted.
Q: Can I put a padlock on the box?
A: Many models include a built-in lock. If not, look for a box with a hasp that accepts a standard padlock.
Q: Does the plastic fade in the sun?
A: High-quality HDPE plastic has UV protection. It will resist fading for many years.
Q: How much weight can the box hold?
A: Most boxes hold 50 to 75 pounds. Check the manufacturer’s weight limit to avoid damaging the hinges.