You’ve got valuable tools that need proper protection under your tonneau cover. Finding the right toolbox isn’t just about storage—it’s about maximizing your truck bed’s functionality while keeping everything secure and organized. We’ll walk you through four top options that balance durability, space efficiency, and security features you’ll actually want.
DU-HA Side Toolbox and Gear Storage Humpstor for Open Beds
If you’re hauling firearms and gear alongside your everyday cargo, the DU-HA Side Toolbox won’t leave you scrambling for secure storage. This 55-inch unit fits perfectly above your truck’s wheel well, maximizing otherwise wasted space. You’ll appreciate the waterproof construction with rubber T-latches that keep dust and moisture out. The lift-off lid design provides easy access, while lockable security protects valuables from theft. Two compartments with dividers let you organize tools, ammunition, and equipment efficiently. An optional rifle rack kit accommodates shotguns and rifles upright. At 33 pounds, it’s manageable yet sturdy. Best of all, adjustable brackets work seamlessly with tonneau and roll-up covers, making it versatile for your truck bed setup.
Best For: Truck owners who need secure, weatherproof storage for firearms, tools, and gear while maximizing bed space above the wheel well.
Pros:
- Waterproof construction with lockable security protects valuables from theft and weather elements
- Two compartments with dividers and optional rifle rack kit provide organized storage for diverse cargo including firearms
- Adjustable brackets ensure compatibility with tonneau covers and roll-up covers for versatile truck bed configurations
Cons:
- Low customer rating of 2.8 out of 5 stars suggests potential quality or durability concerns
- 33-pound weight may require assistance for installation or removal
- Limited availability of customer reviews makes it difficult to assess long-term performance and reliability
UWS Secure Lock 48-Inch Under Tonneau Cover Tool Box (EC20503)
Truck owners who want secure, weatherproof storage without sacrificing tonneau cover compatibility should consider the UWS Secure Lock. This 48-inch under tonneau tool box features an extra-thick 0.058-inch aluminum construction and patented RigidCore foam-filled lid that resists warping. You’ll appreciate the dual-locking twist handles that secure from either side, plus the MicroSeal gasket that keeps water, dust, and insects out. At 16.5 inches tall, it maintains a low profile for tonneau fit while providing 250 liters of storage capacity. Made in the USA, it’s designed for easy truck bed installation and delivers robust security for your tools and gear.
Best For: Truck owners seeking secure, weatherproof storage that fits under tonneau covers without compromising bed space or security.
Pros:
- Extra-thick 0.058-inch aluminum construction with patented RigidCore foam-filled lid provides superior durability and resistance to warping
- Dual-locking twist handles with connecting rod and pry-resistant enclosure deliver enhanced security for tools and gear
- MicroSeal gasket and water-resistant design keep contents protected from water, dust, dirt, and insects while maintaining a low 16.5-inch profile for tonneau compatibility
Cons:
- Some customer feedback indicates concerns about build quality and finish consistency
- 48-pound weight capacity may be limiting for heavier tools or equipment storage needs
- Higher item weight of 50.9 pounds can make installation and repositioning more difficult
UWS Secure Lock 48-Inch Aluminum Under Tonneau Cover Tool Box
For truck owners who demand both security and weather protection, the UWS Secure Lock 48-Inch Aluminum Under Tonneau Cover Tool Box delivers exceptional value. You’ll appreciate the patented RigidCore foam-filled lid that resists warping and binding, while the extra-thick 0.058-inch aluminum construction withstands tough conditions. The MicroSeal gasket keeps water, dust, and insects out, protecting your tools effectively. Installation’s straightforward on most pickup trucks, and the offset design fits seamlessly under tonneau covers. With dual-locking twist handles, a 90-degree self-opening lid, and a secure connecting rod system, you’re getting reliable storage that holds up to 250 liters. At just 52 pounds, it won’t burden your truck bed.
Best For: Truck owners who need secure, weather-resistant storage under their tonneau covers and want reliable protection for tools and equipment.
Pros:
- Patented RigidCore foam-filled lid provides superior rigidity and resistance to warping and binding
- Extra-thick 0.058-inch aluminum construction with Secure Lock system offers excellent durability and security
- MicroSeal gasket effectively keeps out water, dust, dirt, and insects for superior weather protection
Cons:
- Maximum weight capacity of 52 pounds limits storage for heavier tools and equipment
- 8.85 cubic feet capacity may be insufficient for users requiring larger storage volumes
- Requires existing tonneau cover compatibility, reducing flexibility for truck bed configurations
RealTruck TruXedo TL TonneauMate Toolbox for Full Size Trucks
You’ll find the TruXedo TL TonneauMate is ideal if you’re looking for versatile storage that doesn’t compromise your truck bed’s usable space. This toolbox clamps securely to your bed’s side rails underneath your tonneau cover, positioning itself anywhere along the bed. Its elevated mounting system keeps the floor clear for additional cargo. The box holds up to 200 pounds and features a lock-and-key mechanism for security. Compatible with most full-sized trucks, you’ll appreciate its durable construction and USA manufacturing. However, some customers report installation challenges and occasional incompatibility with certain bed covers. With 4.2 stars from 360 ratings, it’s a solid choice despite minor drawbacks.
Best For: Truck owners who need secure, versatile storage without sacrificing usable truck bed space.
Pros:
- Elevated mounting system keeps truck bed floor clear for additional cargo
- Durable construction holds up to 200 lbs with lock-and-key security mechanism
- Compatible with most full-sized trucks and made in the USA
Cons:
- Some customers report installation difficulties and compatibility issues with certain truck bed covers
- Requires clamping to side rails underneath tonneau cover, limiting placement flexibility
- Average rating of 4.2 stars indicates room for improvement in design or instructions
Factors to Consider When Choosing an Under Tonneau Cover Toolbox
When you’re selecting an under tonneau cover toolbox, you’ll want to confirm it fits your truck’s dimensions and works seamlessly with your specific tonneau model. You should evaluate the construction materials and durability features alongside water resistance capabilities and locking mechanisms that’ll protect your tools from theft and weather damage. Finally, you’ll need to assess storage capacity and internal layout to guarantee the toolbox accommodates your tools efficiently without wasting space.
Height and Tonneau Compatibility
Because tonneau covers have specific height limitations, selecting a toolbox that fits within those constraints is vital for maintaining both compatibility and functionality. You’ll want to opt for a low-profile toolbox around 16 to 17 inches high, which typically fits well under most tonneau covers while maximizing your bed space.
Beyond height, you need to take into account how the toolbox’s opening mechanism interacts with your cover. An offset lid design works particularly well, allowing you to access your tools easily without compromising the cover’s streamlined appearance or operation. Always verify the manufacturer’s specifications for both your toolbox and tonneau cover to confirm they’re compatible. This confirmation prevents costly mistakes and guarantees a secure fit that optimizes your truck’s storage capabilities.
Material and Durability Construction
Material selection forms the foundation of a toolbox’s longevity and performance under a tonneau cover. You’ll want aluminum construction because it delivers lightweight strength without compromising durability. Look for toolboxes with thicker aluminum plating—around 0.058 inches—which prevents warping and binding over extended use.
RigidCore technology represents a significant upgrade. This innovative system sandwiches a solid foam core between aluminum plates, dramatically enhancing structural integrity and lid performance. You’ll notice the difference when opening and closing your toolbox repeatedly.
Don’t overlook waterproofing and dust resistance. Gaskets along the lid seam protect your stored items from rain, moisture, and debris. These features work together to safeguard your tools and equipment, ensuring your toolbox remains functional and your belongings stay protected throughout all seasons.
Water Resistance and Sealing
Your toolbox’s ability to keep moisture out directly determines whether your tools stay protected under a tonneau cover. You’ll want to prioritize models featuring a MicroSeal gasket along the lid seam, which greatly reduces water, dust, dirt, and insect infiltration. Look for heavy-duty aluminum construction, as this material resists corrosion and maintains structural integrity against rain and snow exposure.
Verify that your toolbox includes a secure latch system ensuring a tight seal when closed, preventing water from seeping inside during storage. Check product specifications for water resistance ratings, which clarify how well the toolbox withstands prolonged liquid exposure. These technical details matter when selecting a reliable storage solution. A properly sealed toolbox guarantees your equipment remains dry and protected throughout changing seasons and weather conditions.
Security and Locking Mechanisms
While a sealed toolbox protects your tools from the elements, it won’t stop a determined thief from accessing them. You’ll want robust locking mechanisms that deter unauthorized access effectively.
Dual-locking systems or twist handles provide enhanced security by making your toolbox considerably harder to breach. Look for pry-resistant features that resist tampering and forced entry attempts. The ability to lock from both sides offers convenience while maintaining flexibility in accessing your tools quickly when needed.
For specialized storage, dedicated locking compartments for guns or valuable tools add another security layer within your toolbox itself. When you combine these locking features with waterproof design, you’re protecting your investment thoroughly—safeguarding against both theft and environmental damage simultaneously.
Storage Capacity and Layout
Three critical factors determine whether a toolbox’ll truly serve your needs: volume, compartmentalization, and weight capacity.
Start by evaluating volume. You’ll find options like 250.61-liter models that accommodate substantial tool collections and equipment. Next, examine the layout. Single-compartment designs offer simplicity, while multiple compartments with dividers keep your gear organized and easily accessible. This organization saves you valuable time when you’re locating specific tools.
Weight capacity matters notably. Many quality toolboxes handle up to 200 lbs of cargo, letting you store heavier items securely without worry. Check the dimensions carefully—your toolbox must fit comfortably under your tonneau cover without eating into your truck bed’s usable space.
Finally, consider materials. Heavy-duty aluminum construction provides durability while maximizing storage capabilities, ensuring your investment lasts years.
Installation Ease and Flexibility
Getting your toolbox properly mounted matters just as much as selecting the right model. You’ll want to prioritize toolboxes with straightforward mounting systems that clamp directly to your truck bed’s side rails, ensuring efficient installation without unnecessary complications.
Check that your toolbox features adjustable brackets or a design compatible with various tonneau cover types. This flexibility lets you adapt the setup to your specific truck and cover configuration.
Weight and dimensions greatly impact installation ease. Lighter models are easier to handle, while compact dimensions prevent bed obstruction. Review product specifications thoroughly for installation instructions, as some toolboxes require additional clamps or hardware kits. Understanding these requirements upfront saves you time and frustration during setup.
Weight Capacity Considerations
Since you’ll be storing tools and equipment beneath your tonneau cover, understanding weight capacity is essential for safe operation. Most under tonneau toolboxes, like UWS models, cap out around 48 to 52 pounds—a limit you shouldn’t exceed.
Before purchasing, verify the toolbox’s weight distribution design to prevent stability issues while driving. You’ll want durable construction materials like heavy-wall aluminum or reinforced designs that resist deformation under significant loads.
Assess how the toolbox’s structure distributes weight evenly across your truck bed. Uneven weight distribution can damage the toolbox or compromise your vehicle’s handling. Match the toolbox’s capacity to your actual storage needs, ensuring you’re not overloading it. This careful consideration protects both your equipment and your truck’s performance.