6 Best Wheel Well Toolboxes to Maximize Bed Space

Every square inch of a farm truck bed feels precious, especially when you’re trying to haul feed bags, a few hay bales, and the tools you need for the day’s work. A traditional crossover toolbox can feel like a permanent roadblock, forcing you to choose between carrying your gear or your cargo. The right wheel well toolbox solves this problem, turning wasted space into a strategic asset for keeping your farm running smoothly.

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Why a Wheel Well Toolbox is a Farmer’s Friend

On a small farm, your truck isn’t just transportation; it’s a mobile workshop, a feed hauler, and sometimes, an impromptu workbench. The biggest challenge is keeping essential tools on hand without sacrificing the open bed space needed for bulky items. A standard crossover toolbox cuts your bed length short, making it impossible to lay an 8-foot sheet of plywood flat or easily load an IBC tote for hauling water to a back pasture. This is where a wheel well toolbox proves its worth.

These boxes are designed to fit into the dead space around and over your truck’s rear wheel wells. This design is a game-changer. It means you can keep tow straps, fencing pliers, a grease gun, and other essentials secure and organized without compromising your ability to haul a small square baler, a load of T-posts, or crates of produce to the farmers market.

By reclaiming the full length of your bed floor, you gain incredible flexibility. You no longer have to unload your entire toolbox just to make a quick run for lumber or pick up a new gate. It’s about efficiency—reducing the number of trips you make and the time you spend rearranging cargo. For a part-time farmer, saving that kind of time and hassle is as valuable as any tool in the box.

DECKED Truck Tool Box: The Ultimate System

Let’s be clear: the DECKED system is more than just a toolbox; it’s a complete bed organization and storage solution. It creates a raised, weatherproof deck that can handle a 2,000-pound payload, with two full-length, roll-out drawers underneath. This isn’t for the farmer who just needs to stash a hammer and some pins. This is for the farmer whose truck is their primary command center for every operation on the property.

The real advantage is the sheer level of organization and security. One drawer can hold your power tools, spare parts, and veterinary supplies, while the other can be dedicated to recovery gear, irrigation fittings, and tie-downs. Everything is locked, out of sight, and protected from rain, dust, and snow. You can still haul hay, feed sacks, or even a small ATV on the raised deck, meaning you sacrifice zero hauling capacity.

The DECKED system is a significant investment, and its installation is more involved than a simple bolt-on box. However, if you’re constantly fighting a losing battle with clutter, need to secure high-value tools, and want to fundamentally change how you use your truck bed, this is the definitive answer. This is the system for the hyper-organized farmer who demands maximum security and efficiency and is willing to invest in it.

UnderCover SwingCase: Best for Easy Access

The UnderCover SwingCase is built around one brilliant feature: it pivots nearly 180 degrees from its locked position over the wheel well to rest over the lowered tailgate. This means you can access your tools without ever having to climb into the truck bed. For anyone who’s ever strained their back reaching for a tool in the far corner of the bed, the appeal is immediate and obvious.

This toolbox is perfect for storing high-frequency, smaller items. Think fencing tools, linchpins for implements, a hoof pick, leather gloves, or a first-aid kit. It’s made from a lightweight but durable ABS composite, so it won’t rust or dent easily, though it offers less security for heavy or high-value items compared to a steel or aluminum box. The lock is more of a deterrent than a high-security feature.

The SwingCase is easily removable, lifting right off its hinge pins if you need to temporarily clear the entire bed side. Its capacity is modest, so it won’t hold a cordless impact wrench and a full socket set. If you need instant, effortless access to a curated set of daily-use tools and prioritize convenience over massive capacity or high security, the SwingCase is exactly what you need.

UWS Side Mount Box: Classic Aluminum Durability

Sometimes, you just want a simple, tough, and reliable solution that’s been proven for decades. The UWS Side Mount Box is exactly that. These boxes are typically mounted on the bed rails and sit above the wheel well, offering a classic look and rock-solid performance. Made from thick, diamond plate aluminum, they are built to withstand the rigors of farm life without rusting.

The UWS box offers significantly more storage space than a swing-out case, making it suitable for bulkier items like tow chains, larger hand tools, and fluid containers. The stainless steel, lockable paddle handle is secure and easy to operate even with gloves on. Because it sits on the bed rail, it doesn’t interfere with floor space, but it does slightly reduce the width of your bed opening at the top, which is a consideration for hauling certain items.

This is a no-frills, function-first toolbox. It doesn’t have fancy swing-out mechanisms, but it makes up for it with sheer toughness and dependable security. For the farmer who values traditional durability and needs a straightforward, secure place to store a serious collection of tools, the UWS side mount is a workhorse that will never let you down.

Better Built Wheel Well Box: A Tough Steel Pick

While aluminum is great for corrosion resistance, nothing beats steel for pure impact strength. The Better Built Wheel Well Box is constructed from heavy-gauge steel with a protective powder coat finish, making it an excellent choice for storing heavy, sharp, or irregularly shaped tools. You can toss in a log splitter wedge, heavy-duty shackles, or a framing hammer without worrying about punching a hole through the side.

The main tradeoff with steel is the risk of rust. If the powder coating gets deeply scratched—a near certainty on a working farm—you’ll need to touch it up with paint to prevent corrosion from taking hold. These boxes are also heavier than their aluminum or plastic counterparts, which is a minor consideration for fuel economy but worth noting.

This box is designed to fit discreetly inside the bed, sitting directly over the wheel well on the bed floor. It provides a good balance of capacity and a low profile. If your primary concern is containing heavy, rough-and-tumble equipment and you prioritize impact resistance above all else, the Better Built steel box is the tough-as-nails option you’re looking for.

TruXedo TonneauMate: Pairs with a Bed Cover

A common frustration for truck owners is finding a toolbox that works with a tonneau cover. The TruXedo TonneauMate is designed specifically to solve this problem. It mounts to the side of the bed using the same rail system as many popular tonneau covers, sitting under the cover and leaving the bed rails completely free. This creates a fully secured, weatherproof system for both your tools and your cargo.

The TonneauMate can be mounted toward the front or rear of the bed, offering flexibility in how you configure your setup. While designed for TruXedo covers, it can often be adapted to work with other brands that use similar C-clamp mounting systems. Its capacity is generous, providing ample room for a wide range of tools and equipment that you want to keep completely out of the elements.

This isn’t a universal fit for every truck and every cover, so confirming compatibility is crucial. But if you already have a tonneau cover or plan to get one, this box is a game-changer. For the farmer who needs the dual benefit of a secure toolbox and a covered, dry bed for hauling feed, seed, or produce, the TonneauMate is the most integrated and logical choice.

DU-HA Humpstor: Best for Above-Well Storage

The DU-HA Humpstor takes a unique approach by using the space above the wheel well, essentially creating a secure, full-length shelf. It mounts just under the bed rails and runs the length of the "hump," making it the perfect storage solution for long, skinny items that are awkward to store anywhere else. Think pry bars, long-handled shovels, fishing rods, or even a farm rifle.

This design keeps your items organized, secure, and off the bed floor, preventing them from rolling around and getting damaged. It’s made from heavy-duty polyethylene, so it’s incredibly durable and won’t rust. The Humpstor also functions as a gun case in many states, adding a layer of utility for farmers who also hunt on their property.

The obvious limitation is that it’s not designed for bulky items. You won’t be fitting a toolbox full of sockets or a cordless drill in here. It serves a very specific purpose, but it does it exceptionally well. If your biggest storage headache is finding a home for long tools and you want to keep them secure and out of the way, the Humpstor is a uniquely effective solution.

Key Features: Material, Security, and Capacity

Choosing the right toolbox comes down to honestly assessing your needs based on three key factors. Don’t get sold on a feature you won’t use; focus on what solves your specific farm problems.

• Material: The material dictates durability, weight, and maintenance. Aluminum is the all-around winner for most, offering a great balance of strength, low weight, and natural corrosion resistance. Steel is the choice for maximum impact resistance but requires you to stay on top of scratches to prevent rust. Plastic/Composite boxes are the lightest, rust-proof, and often the most affordable, but they offer the lowest level of security and can become brittle in extreme cold.

• Security: How valuable are the tools you’re storing? A simple latch and key might be enough to deter casual theft of a few hand tools. But if you’re storing expensive cordless power tools or specialized equipment, you need a box with a robust, pry-resistant locking mechanism. Consider the environment you’re in—a box parked deep on your property has different security needs than one left in a store parking lot for hours.

• Capacity: Be realistic about what you need to carry every day. Is this for a tow strap, a pair of gloves, and a multi-tool? A small, convenient swing-out case is perfect. Or do you need to carry a full set of wrenches, a grease gun, spare belts, and a hydraulic jack? In that case, you need to look at the larger side-mount or in-bed models and pay close attention to the cubic feet of storage they offer.

Installation Tips for a Secure, Rattle-Free Fit

A toolbox is only as good as its installation. A loose, rattling box is not only annoying on a bumpy farm lane but can also damage your truck bed and the box itself over time. The goal is a fit so secure it feels like it’s part of the truck.

First, always follow the manufacturer’s instructions, but don’t be afraid to improve upon them. If the kit comes with standard nuts and bolts, consider upgrading to nylon-insert lock nuts (nylocs) or using a drop of blue thread locker on the threads. These will prevent vibrations from loosening the hardware over time, which is a constant battle on any working vehicle.

Before you drill any holes, double-check all clearances. Make sure the toolbox lid can open fully without hitting the side of the bed or a tonneau cover rail. If you have a plastic bed liner, you may need to trim small sections for the mounting brackets to sit flush against the metal bed. A secure, metal-to-metal connection is always stronger. Finally, after a week of driving on rough terrain, go back and re-tighten all the mounting hardware.

Maintaining Your Toolbox for Long-Term Farm Use

A farm truck toolbox lives a hard life, exposed to mud, dust, moisture, and corrosive materials like fertilizer. A little preventative maintenance goes a long way in ensuring it lasts for years. The most important task is regular cleaning. Don’t let damp mud, wet leaves, or spilled chemicals sit in the bottom of the box, as this will accelerate corrosion, especially in steel models.

Periodically, lubricate the hinges and locking mechanisms. A shot of dry graphite lubricant is perfect for locks, as it won’t attract the dust and grit that are unavoidable on a farm. For hinges, a spray of white lithium grease will keep them operating smoothly and quietly.

For steel boxes, keep an eye out for deep scratches in the paint or powder coat. As soon as you see exposed metal, clean the area and touch it up with a rust-inhibiting primer and matching paint. For aluminum boxes, while they won’t rust, they can still oxidize. A good cleaning and an occasional polish with an aluminum cleaner will keep the finish looking good and prevent heavy pitting.

Ultimately, the best wheel well toolbox is the one that seamlessly integrates into your daily workflow. It’s not about having the biggest or toughest box, but about choosing the right design to keep your essential gear organized, secure, and out of the way. By maximizing that often-overlooked space in your truck bed, you make your most important piece of farm equipment even more versatile and efficient.