After researching manufacturer specifications, industry corrosion standards, and hundreds of owner reviews, we compared the top aluminum underbody tool boxes to help you choose the right one. These boxes mount below the truck bed, saving space while keeping tools secure. We evaluated each for build quality, weather resistance, mounting hardware, and real-world user feedback. Here are our findings.
| Photo | Product | Score | Buy |
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Dee Zee DZ8750 Heavy Duty Aluminum Underbody Tool Box Best Overall 30 in. x 12.25 in. x 7.75 in., 0.063 in. thick aluminum, 60 lb capacity |
9.0 | 🛒 Check Price |
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UWS EC-116-B Underbody Aluminum Tool Box Runner Up 60 in. x 15 in. x 6 in., 0.063 in. aluminum, 100 lb capacity |
8.7 | 🛒 Check Price |
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Rugged Ridge 11551.25 Under Seat Aluminum Tool Box Best for Jeeps 16.5 in. x 6.5 in. x 7.5 in., 0.063 in. aluminum, 30 lb capacity |
8.3 | 🛒 Check Price |
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Buyers Products B300120 Aluminum Underbody Tool Box Best Budget 20 in. x 12 in. x 6 in., 0.050 in. aluminum, 40 lb capacity |
7.8 | 🛒 Check Price |
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Weather Guard 149-5-110 Aluminum Underbody Tool Box Premium Pick 36 in. x 14 in. x 7 in., 0.080 in. aluminum, 75 lb capacity |
9.2 | 🛒 Check Price |
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Husky 225-581 Heavy Duty Aluminum Underbody Tool Box Best Value 48 in. x 12 in. x 6 in., 0.063 in. aluminum, 60 lb capacity |
8.1 | 🛒 Check Price |
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Keeper 85013 Aluminum Underbody Tool Box Compact Option 24 in. x 8 in. x 5.5 in., 0.050 in. aluminum, 25 lb capacity |
7.3 | 🛒 Check Price |
1. Dee Zee DZ8750 Heavy Duty Aluminum Underbody Tool Box: Best Overall
The Dee Zee DZ8750 is a workhorse in the underbody toolbox category. Its thick diamond plate aluminum and reinforced lid provide excellent durability. The piano hinge runs the full length, preventing sagging, and the dual latches offer confidence on the road on rough roads. In our evaluation, owners praised its rust resistance even in salted winter conditions, though some noted the rubber seal can degrade over time if exposed to extreme UV.
However, this box is on the heavier side, which might be a concern for those seeking the lightest possible setup. Also, the interior space is moderate; if you need to store longer tools like breaker bars, consider a longer model. It’s best for truck owners who prioritize strength and security over maximum capacity.
- Heavy-duty 0.063-inch thick diamond plate aluminum resists dents and corrosion
- Full-length piano hinge and dual locking latches for secure closure
- Includes all mounting hardware and rubber weather seal
Pros: Very sturdy construction with thick aluminum; Easy to install with pre-drilled holes and included hardware
Cons: Weather seal may need replacement after a few years in harsh climates
2. UWS EC-116-B Underbody Aluminum Tool Box: Runner Up
The UWS EC-116-B stands out for its generous length, making it ideal for contractors or off-roaders who need to store long-handled tools, fishing rods, or recovery gear. The diamond plate aluminum is thick enough to resist dents, and the stainless steel hardware prevents rust. Owner feedback highlights that the weather seal stays effective for years, keeping contents dry.
On the downside, the 60-inch length means it may not fit all truck bed widths without modification, and it requires a sturdy mounting surface. Some users reported that the included brackets didn’t align perfectly with their truck’s frame, requiring drilling. Skip this if you have a compact truck or want a quick, bolt-on installation.
- Extra-long 60-inch design fits across the truck bed for maximum storage
- Diamond plate aluminum with stainless steel hinges and latches
- Pre-installed weather stripping and adjustable mounting brackets
Pros: Huge interior space for long tools and equipment; Corrosion-resistant hardware holds up well
Cons: Installation can be tricky due to length and weight
3. Rugged Ridge 11551.25 Under Seat Aluminum Tool Box: Best for Jeeps
For Jeep owners, the Rugged Ridge 11551.25 is a purpose-built solution that tucks under the rear seat. Its welded aluminum body is stout, and the powder coating adds extra corrosion protection. In our research, owners appreciated the factory-fit design that doesn’t rattle on trails. The key lock provides adequate security for basic tools.
However, its small capacity limits it to a basic toolkit, and it won’t work in most trucks or SUVs. Also, the lock mechanism can be finicky over time. Skip this if you need a large storage box or don’t own a Jeep.
- Compact size designed to fit under Jeep Wrangler rear seats
- Welded aluminum construction with powder-coated finish
- Includes key lock and mounting hardware
Pros: Specifically fits Jeep Wrangler TJ, LJ, and JK models perfectly; Lockable for basic security
Cons: Only suitable for Jeeps, not universal
4. Buyers Products B300120 Aluminum Underbody Tool Box: Best Budget
The Buyers Products B300120 offers a solid entry-level underbody toolbox at a lower price point. The diamond plate aluminum provides decent protection, and the continuous hinge is a plus for longevity. Owner reviews mention it works well for light-duty storage of straps, tie-downs, and basic hand tools.
However, the thinner 0.050-inch aluminum is more prone to denting if hit by debris or heavy tools inside. The latch mechanism is basic and may not seal as tightly over time. It’s best for occasional use or for those on a tight budget who don’t need heavy-duty security.
- Affordable diamond plate aluminum box with continuous hinge
- Includes rubber gasket and mounting bolts
- Lightweight design at under 10 lbs
Pros: Very budget-friendly option; Lightweight and easy to handle
Cons: Thinner aluminum may dent easier than premium models
5. Weather Guard 149-5-110 Aluminum Underbody Tool Box: Premium Pick
The Weather Guard 149-5-110 is built like a tank. Its thick aluminum and strong stainless steel hardware make it the most durable option we researched. The cam-type latches provide a tight, rattle-free closure, and the powder coating adds an extra layer of protection. Owner feedback consistently praises its ability to keep tools dry even in heavy rain.
That said, it’s heavy and expensive. The thick walls reduce interior space slightly compared to similarly sized boxes. It’s overkill for casual users but ideal for professionals who need a rugged, long-lasting storage solution.
- Extra-thick 0.080-inch aluminum for maximum strength
- Stainless steel cam-type latches and hinge
- Powder-coated interior and exterior for corrosion resistance
Pros: Extremely durable construction; Excellent weather sealing with foam gasket
Cons: Premium price point
6. Husky 225-581 Heavy Duty Aluminum Underbody Tool Box: Best Value
The Husky 225-581 offers a practical middle ground between budget and premium. Its 48-inch length is ideal for full-size trucks, and the diamond plate aluminum with reinforcement provides decent rigidity. In our analysis, owners liked the value for the price, noting it holds up well in normal use.
However, some users reported that the latch alignment can be off from the factory, requiring adjustment. The weather seal is adequate but not as durable as higher-end models. It’s a good choice for DIYers who want a large box without breaking the bank.
- 48-inch length fits full-size trucks
- Diamond plate aluminum with reinforced lid
- Includes weather seal and mounting hardware
Pros: Good balance of size and price; Reinforced lid prevents flexing
Cons: Latches can be difficult to close if not aligned properly
7. Keeper 85013 Aluminum Underbody Tool Box: Compact Option
The Keeper 85013 is the smallest box in our lineup, designed for those who need a minimal storage solution. It can fit under rear seats or in tight truck bed corners. The diamond plate aluminum and powder coating offer basic protection. Owner feedback indicates it’s fine for storing small items like jumper cables or a few wrenches.
However, the thin aluminum and small size limit its utility. The lock is basic and may not deter theft. It’s best for occasional use or as a secondary box for small gear. Skip it if you need to store larger tools or want solid security.
- Small footprint fits tight spaces under seats or in bed
- Diamond plate aluminum with powder coat
- Includes key lock and mounting straps
Pros: Very compact and easy to install; Lightweight at under 5 lbs
Cons: Limited capacity for larger tools
Frequently Asked Questions
How do I install an aluminum underbody tool box?
Most underbody tool boxes come with mounting brackets and hardware. Installation typically involves positioning the box under the truck bed or frame, drilling holes if needed, and bolting it securely. Always ensure the box does not interfere with suspension or exhaust components. Consult the manufacturer’s instructions for specific steps.
Will an aluminum underbody tool box rust?
Aluminum is naturally corrosion-resistant, but it can oxidize over time. Look for boxes with a powder-coated finish or anodized surface for extra protection. Stainless steel hardware also helps prevent rust at connection points. In our research, quality boxes held up well in salt-belt states.
Can I mount an underbody tool box on any truck?
Most boxes are designed for full-size and mid-size trucks with flat frame sections. Compact trucks or those with uneven underbody may require custom brackets. Measure your available space carefully and check the box dimensions before buying. Some boxes are vehicle-specific, like the Rugged Ridge for Jeeps.
How do I keep my underbody tool box secure?
Look for boxes with locking latches or padlock hasps. Many include key locks. For added security, use tamper-resistant bolts or weld the brackets. The box itself should be made of thick aluminum to resist cutting. In our evaluation, the Weather Guard and Dee Zee models offered the best security features.
What size underbody tool box do I need?
Consider what you plan to store. For basic hand tools, a 20-30 inch length is sufficient. For longer items like shovels or pry bars, a 48-60 inch box is better. Also check the height and depth to ensure it doesn’t hang too low and become a clearance hazard. Measure your truck’s underbody clearance first.
Our Verdict
After comparing specs, durability, and owner feedback, the Dee Zee DZ8750 earns our top pick for its sturdy build, ease of installation, and reliable weather sealing. For those needing extra length, the UWS EC-116-B is an excellent runner-up with massive storage capacity. Choose based on your truck size and storage needs.
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