We researched and compared the most popular narrow tool boxes for trucks, focusing on models that fit behind the cab or under tonneau covers without wasting bed space. Our evaluation is based on manufacturer specifications, published industry standards, and aggregated owner feedback from verified buyers. We considered durability, security, ease of installation, and real-world fitment across popular truck models.
Whether you need a slim crossover box, a low-profile chest, or a compact side-mount, this guide covers the top options. We highlight genuine strengths and limitations so you can pick the right box for your needs.
| Photo | Product | Score | Buy |
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UWS EC108 Low Profile Crossover Tool Box Best Overall 60-inch wide, 12-inch deep, diamond plate aluminum, low-profile design |
9.0 | 🛒 Check Price |
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Dee Zee DZ9530 Heavy Duty Chest Tool Box Best Heavy-Duty 30-inch wide, 12-inch deep, 16-gauge steel, black powder coat |
8.7 | 🛒 Check Price |
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Weather Guard 124-5-110 Low Profile Saddle Box Best Low-Profile 60-inch wide, 11-inch deep, aluminum, low-profile |
8.4 | 🛒 Check Price |
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Rugged Ridge 18000.10 Underseat Tool Box Best for Jeep Gladiator & Compact Trucks Fits under rear seat of Jeep Gladiator, 22-inch wide, steel |
8.1 | 🛒 Check Price |
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Buyers Products B2030 Aluminum Crossover Tool Box Best Value 60-inch wide, 12-inch deep, aluminum, black finish |
7.8 | 🛒 Check Price |
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Delta 22150-2 Side-Mount Tool Box Best Side-Mount 15-inch wide, 20-inch deep, diamond plate aluminum, side-mount |
7.3 | 🛒 Check Price |
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Plano 0450012 Sportsman Trunk Best Portable Option 48-quart capacity, heavy-duty plastic, not lockable |
7.1 | 🛒 Check Price |
1. UWS EC108 Low Profile Crossover Tool Box: Best Overall
We found the UWS EC108 to be the best balance of durability, security, and low-profile design. Its diamond plate aluminum is thick and rigid, and the powder-coated finish resists UV and scratches. Owner feedback consistently praises the gas struts that hold the lid open securely. The box uses a rotary latch system that many users report as very secure.
However, this box is heavy and may require two people to lift and align during installation. Also, the interior is not fully divided, so smaller items can slide around. Skip this if you need a lightweight box or if your truck bed has unique contours that might require shimming. It fits full-size trucks best.
- Diamond plate aluminum construction resists dents and corrosion
- Low-profile shape fits under most tonneau covers
- Gas spring props for easy one-handed opening
Pros: Excellent build quality and finish; Slim profile does not block rear window visibility
Cons: Heavy at over 40 pounds, installation may require two people
2. Dee Zee DZ9530 Heavy Duty Chest Tool Box: Best Heavy-Duty
In our evaluation, the Dee Zee DZ9530 stands out for its brute strength. The 16-gauge steel is thicker than many competitors, and the welded seams add to its rigidity. Owners report it holds up well under heavy tools and even occasional standing. The sliding tray is a nice touch for organizing sockets and wrenches.
But the 30-inch width is on the narrow side, so it may not sit flush in wider truck beds without additional mounting brackets. Also, the black powder coat can chip if scraped against metal. Skip this if you need a wider box that spans the full bed width or if you prefer aluminum for lighter weight.
- 16-gauge steel construction with welded seams
- Continuous lid hinge and lockable latch
- Sliding tray for small parts organization
Pros: Extremely rugged; can support heavy loads on lid; Sliding tray keeps small items accessible
Cons: Narrow width may not fit larger trucks' bed width without spacers
3. Weather Guard 124-5-110 Low Profile Saddle Box: Best Low-Profile
Weather Guard is known for commercial-grade truck boxes, and this saddle box is no exception. The aluminum body is lightweight yet strong, and the stainless steel hardware resists rust. The low height allows it to fit under most tonneau covers without interference. Owners appreciate the secure latching mechanism.
However, the single-side opening can be a drawback if you often access the box from the passenger side. Also, the interior is essentially one large compartment, so small items can get lost. Skip this if you need dual-side access or built-in dividers.
- Aluminum construction with stainless steel hinges
- Low-profile design only 11 inches tall
- Single lid opens from driver side for safety
Pros: Very low profile fits under roll-up covers; Corrosion-resistant materials
Cons: Lid opens only from one side, less convenient on passenger side
4. Rugged Ridge 18000.10 Underseat Tool Box: Best for Jeep Gladiator & Compact Trucks
For compact truck owners, especially Jeep Gladiator, this under-seat box is a clever solution. It uses otherwise wasted space and keeps tools hidden. The steel construction is solid, and the lock is decent. Owner feedback highlights the ease of installation with pre-drilled holes.
But this box is extremely specific; it will not fit most full-size trucks or even other midsize models. Also, capacity is limited to smaller tools. Skip this if you don’t own a Gladiator or need a larger tool box for the bed.
- Designed specifically for Jeep Gladiator under-seat storage
- Heavy-duty steel with black powder coat
- Lockable with included T-handle lock
Pros: Perfect fit for Gladiator, no bed space used; Secure and lockable
Cons: Only fits Gladiator; not universal
5. Buyers Products B2030 Aluminum Crossover Tool Box: Best Value
Buyers Products offers a budget-friendly aluminum crossover box that still includes nice features like gas struts and a lock. In our research, owners on a budget found it a good compromise between cost and functionality. It is lightweight, making installation a one-person job.
However, the aluminum gauge is thinner than UWS or Weather Guard, so it is more prone to denting if heavy tools are dropped on it. The lock mechanism is also basic and may not deter determined thieves. Skip this if you need maximum durability or plan to store very heavy tools.
- Lightweight aluminum construction
- Gas spring assisted lid
- Keyed lock for security
Pros: Affordable price point for an aluminum box; Lightweight and easy to install
Cons: Thinner aluminum than premium brands, may dent easier
6. Delta 22150-2 Side-Mount Tool Box: Best Side-Mount
The Delta side-mount box is a practical choice if you need to keep the bed floor clear. It mounts to the side rail, so it does not interfere with long items like lumber. The aluminum construction is decent for the price, and the weather seal helps keep dust out.
However, installation is permanent and requires drilling holes in the bed rail, which may void some truck warranties. Also, the 15-inch width limits storage to smaller tools and accessories. Skip this if you are not comfortable drilling into your truck or need a large storage capacity.
- Side-mount design saves bed floor space
- Diamond plate aluminum with weather seal
- Includes mounting hardware
Pros: Frees up bed space for longer cargo; Easy to access from outside the bed
Cons: Installation requires drilling into bed rail
7. Plano 0450012 Sportsman Trunk: Best Portable Option
For those who need a simple, portable storage bin rather than a permanent tool box, the Plano Sportsman Trunk is a viable option. It is lightweight, has a removable tray, and can be taken out when not needed. Many owners use it for camping gear or light tools.
But it is not designed for security; the lid has no lock and the plastic is easy to break into. It also does not mount to the bed, so it can slide around. Skip this if you need a permanent, lockable tool box or carry expensive tools.
- Lightweight and portable, no permanent installation
- Durable polypropylene with reinforced lid
- Removable tray for organization
Pros: Very affordable and easy to move between vehicles; Water-resistant but not waterproof
Cons: Not secure; lid does not lock and plastic can be cut
Frequently Asked Questions
What is the best narrow tool box for a truck with a tonneau cover?
For trucks with a tonneau cover, the UWS EC108 Low Profile Crossover Tool Box is a top choice. Its low-profile design (only 12 inches tall) fits under most roll-up and folding covers. Also consider the Weather Guard 124-5-110 if you need even lower clearance at 11 inches. Always measure your bed and cover clearance before purchasing.
How do I measure my truck bed for a narrow tool box?
Measure the width of your truck bed between the wheel wells at the front of the bed (where the box will sit). Also measure the depth from the front wall to the tailgate. For crossover boxes, the width is critical. For side-mount boxes, measure the height of the bed rail. Always check the manufacturer’s recommended fitment list.
Are aluminum tool boxes better than steel?
Aluminum is lighter and resists rust, making it easier to install and maintain. Steel is stronger and more dent-resistant but heavier and prone to rust if the paint chips. For narrow boxes that are often exposed to weather, aluminum is generally preferred. However, heavy-duty users may prefer steel for maximum durability.
Can I install a narrow tool box myself?
Most narrow tool boxes come with mounting hardware and instructions. Installation typically involves clamping or bolting the box to the bed rails or floor. Many owners can do it in under an hour with basic tools. However, heavier boxes like the UWS EC108 may require two people. Side-mount boxes often require drilling, which is more involved.
What is the most secure narrow tool box?
Based on owner feedback and lock design, the Weather Guard 124-5-110 and UWS EC108 offer the best security with robust rotary latches and keyed locks. The Dee Zee DZ9530 also has a heavy-duty latch. Plastic boxes like the Plano Sportsman Trunk offer minimal security and are not recommended for valuable tools.
Our Verdict
After researching and comparing the top narrow tool boxes, the UWS EC108 Low Profile Crossover Tool Box earns our top pick for its excellent build quality, low profile, and secure latching. It is a versatile choice for most full-size trucks. For a runner-up, the Dee Zee DZ9530 Heavy Duty Chest offers superior strength for those who prioritize durability over weight. Choose based on your truck model and storage needs.
Last reviewed and spec-checked: March 11, 2026. We re-check our picks and listings periodically.
