10 Best Side Mount Truck Bed Tool Boxes of 2026: Secure, Space-Saving Picks for Pickups and Work Trucks

Side mount truck bed tool boxes are a smart way to add locked storage without giving up valuable bed space. They’re especially useful for contractors, weekend haulers, and anyone who wants quick access to tools and gear.

In this roundup, we focus on size, material, locking security, and fit so you can choose a box that works with your truck and your daily workload.

Best 10 Side Mount Truck Bed Tool Boxes Picks for 2026

Lo-Sider Aluminum – 60-inch Side Mount Truck Tool Box

If you want side mount truck bed tool boxes that keep the bed floor open, this 60-inch aluminum Lo-Sider is built for quick truck-side access. The welded 0.058-inch aluminum tub keeps the design lightweight for its size, while the push-button handle adds convenient security for daily use.

Best For: Full-size truck owners who want long, low-profile side access storage with a lockable aluminum build.

Pros:

• Bed rail-mounted design keeps valuable bed space clear
• Welded 0.058-inch aluminum tub for a sturdy, lightweight build
• Lockable push-button handle adds convenience and security
• Weathertight design for practical tool storage

Cons:

• Not water resistant, so it still depends on fit and sealing for protection
• 60-inch size may be more box than smaller trucks need

Overall, this is a solid pick if you want a long, side-access toolbox that rides low and stays out of the way. It focuses on straightforward utility rather than extra features, which makes it appealing for work-ready truck setups.

Matte Black Diamond Plate – 48-inch Side-Mount Truck Box

This option in side mount truck bed tool boxes is aimed at buyers who want a compact, weather-resistant aluminum box with a tougher look. The 48-inch side-mount design uses diamond treadplate aluminum, a reinforced lid brace, and premium shocks to make regular access easier.

Best For: Truck owners who want a smaller side-mount box with weather resistance and a black finish.

Pros:

• Rust-resistant diamond treadplate aluminum construction
• Weather-resistant seal helps keep out dirt and moisture
• Premium shocks hold the lid open for easier access
• Matte black finish gives it a clean, low-key look

Cons:

• Single-compartment layout may not suit users who want organization features
• At 48 inches, capacity is more limited than longer side-mount boxes

If you want a practical side-mount box without going oversized, this model keeps the setup simple and durable. It leans toward weather protection and everyday usability, which makes it a good fit for general tool storage.

Black Lo-Sider – 36-inch Aluminum Side Mount Tool Box

Among side mount truck bed tool boxes, this 36-inch black aluminum model is a good fit when you want side access without giving up much bed room. It uses the same welded 0.058-inch aluminum construction as larger versions, but its shorter length makes it easier to match smaller storage needs.

Best For: Drivers who want a shorter side-mount toolbox with a low-profile footprint and lockable access.

Pros:

• Shorter 36-inch size suits tighter truck-bed layouts
• Welded 0.058-inch aluminum tub for durable construction
• Lockable push-button handle with two keys
• Side access keeps the bed floor open for cargo

Cons:

• Not water resistant according to the product details
• Smaller size means less storage than 48-inch and 60-inch options

This is the most space-conscious pick in the lineup and works well if you need easy-access tool storage without a large footprint. It keeps the feature set focused on utility, locking security, and a low-profile fit.

Dual Gas Strut Steel – 34-inch Side Mount Truck Tool Box

If you want side mount truck bed tool boxes with a steel build, this 34-inch model gives you a tough, work-focused option. It attaches to the truck bed rails to keep the floor clear, and the dual gas struts plus keyed latch are designed for smooth, secure everyday access.

Best For: Buyers who prefer a steel side-mount box with a compact footprint and easy-lift lid.

Pros:

• Heavy-duty alloy steel construction with dual powder coating
• Bed rail-mounted design preserves open bed space
• Dual gas struts support one-handed lid opening
• Stainless steel locking latch includes two keys

Cons:

• Shorter 34-inch size provides less storage than larger options
• Heavier steel build may be less convenient than aluminum alternatives

This box is a strong choice if durability matters more than minimizing weight. The steel shell, powder-coated finish, and gas struts make it a practical pickup and RV-side storage option for frequent use.

Compact Side-Rail Storage – 36 Inch Aluminum Side Tool Box

If you want side mount truck bed tool boxes that free up cargo space without adding bulk, this 36-inch aluminum model is built for practical everyday storage. Its side mount design sits on the truck side rails, and the 12″ x 12″ footprint keeps gear organized while still leaving room in the bed for larger items.

Best For: Pickup owners who want a compact, lockable side box for tools, chains, and small job-site gear.

Pros:

• Heavy-duty 0.058-inch aluminum construction for durability
• Weatherproof seal line helps resist water intrusion
• Locking latch and keys add security
• Gas strut lid opens smoothly to 90 degrees

Cons:

• Smaller 36-inch size limits total storage compared with longer boxes
• Single-compartment design offers no internal organization

This is a straightforward choice for drivers who need a tough, space-saving box rather than a large multi-compartment setup. The combination of side-rail mounting, lockable access, and weather resistance makes it a sensible fit for tools and light camping gear.

Long Single-Box Storage – 60 Inch Side Mount Aluminum Toolbox

Among side mount truck bed tool boxes, this 60-inch aluminum unit is aimed at buyers who want a long, narrow storage solution with easy side access. The 60″ x 8″ x 14″ profile is designed to save space in the bed while still giving you room for tools, hardware, and other work gear.

Best For: Truck, trailer, or RV owners who need a long side-mounted box with keyed security.

Pros:

• Long 60-inch format offers generous storage capacity
• Textured aluminum construction with 5 bar tread for durability
• Built-in lock with 2 keys for secure storage
• Waterproof rating helps protect contents from weather

Cons:

• Narrow 8-inch width may not suit bulky items
• No installation accessories or manual are included

This is a practical option if you need length more than depth, especially for tools and equipment that benefit from a slim side-mount layout. The combination of locking security and weather-resistant construction makes it a versatile storage box for work and travel use.

Dual-Box Capacity – 60 Inch Steel Side Mount Tool Box 2 Pack

If you need side mount truck bed tool boxes with more total storage, this 2-pack offers a larger setup for organizing tools, camping gear, and job-site supplies. Each box uses a side mount design that sits on the truck side rails, helping preserve usable bed space for larger cargo.

Best For: Buyers who want two lockable side boxes for maximum storage organization.

Pros:

• Two-box package provides more overall storage capacity
• Side mount design leaves more room in the truck bed
• Weatherproof seal line helps resist water intrusion
• Gas strut lid opens smoothly for easier loading

Cons:

• No installation accessories or instruction manual is provided
• Steel construction may be heavier than aluminum alternatives

This set makes sense for owners who want separate storage compartments across both sides of the bed. With lockable lids and weather-resistant construction, it is built for practical utility rather than a lightweight minimalist setup.

Compact Dual-Pack Side Rail Storage – 36 Inch Aluminum Side Mount Tool Boxes (2 Pack)

If you want side mount truck bed tool boxes that keep the center of the bed open, this 36-inch aluminum 2-pack is built for direct side access. The bed rail-mounted design, 12-inch width, and 90-degree lid make it easier to reach tools without giving up much usable space.

Best For: Truck owners who want a lightweight, lockable side-mount storage setup for tools and everyday gear.

Pros:

• Side mount design lets you access tools from the truck side.
• Welded 0.058-inch aluminum construction keeps weight down at 22 pounds per set.
• Lockable stainless steel handle adds security for stored items.
• 90-degree lid opening helps with loading and unloading.

Cons:

• 36-inch size offers less capacity than longer side-mount boxes.
• Single-compartment layout may not suit organized small-part storage.

This is a practical fit if you want durable, weather-resistant storage that stays low and out of the way. The aluminum build and compact footprint make it a straightforward option for basic truck tool storage.

Heavy-Duty Long-Bed Storage Pair – 48 Inch Steel Side Mount Tool Boxes

For side mount truck bed tool boxes with more room to spread out, this 48.8-inch steel 2-pack offers a larger storage footprint while still mounting on the truck side rails. The weatherproof seal, gas strut lid, and lockable latch make it a strong choice for hauling tools and gear.

Best For: Drivers who need larger-capacity side-mounted storage for tools, equipment, or camping supplies.

Pros:

• Large 48.8-inch size provides ample storage space.
• Heavy-duty steel construction is built for durability.
• Weatherproof seal line helps resist water intrusion.
• Gas strut supports smooth lid opening and closing.

Cons:

• Steel construction weighs more than aluminum options at 26.5 pounds per set.
• Single-compartment design may limit internal organization.

If capacity matters more than minimum weight, this box is the most practical of the group. It gives you side-access storage with a sturdier steel build and a lid designed for easier daily use.

Low-Profile Aluminum Bed Rail Storage – 36 Inch Side Mount Tool Boxes (2 Pack)

This aluminum 2-pack is a simple pick for side mount truck bed tool boxes when you want direct access from the truck side and a lower-riding storage profile. Its welded 0.058-inch aluminum body, lockable handle, and water-resistant design are aimed at everyday truck tool storage.

Best For: Buyers who want a lightweight, weather-resistant side-mount box with a compact footprint.

Pros:

• Bed rail-mounted layout keeps the center of the truck bed open.
• Lightweight aluminum construction is weatherproof and corrosion-resistant.
• Lockable stainless steel handle adds security.
• 90-degree lid opening makes loading easier.

Cons:

• 36-inch length may be small for larger tools or bulkier cargo.
• Single-compartment interior offers limited organization.

Overall, this model fits users who want a no-frills side-mount solution that stays out of the way. The materials and locking features make it a sensible storage choice for basic truck use.

How We Picked the Best Side Mount Truck Bed Tool Boxes

We looked for boxes that balance storage capacity, bed clearance, durability, and everyday convenience. For side-mount use, the most important features are a secure latch, weather protection, and a shape that fits along the bed rail without making loading and unloading harder.

We also considered material choices such as aluminum and steel, since each offers a different mix of weight, strength, and corrosion resistance. Size variety matters too, because a 36-inch box suits compact setups while 48-inch and 60-inch models work better for larger beds and heavier tool loads.

Quick Comparison: What to Expect from Side Mount Truck Bed Tool Boxes

Smaller side boxes are easier to fit in tighter truck beds and usually leave more room for lumber, coolers, or jobsite materials. Larger boxes provide more organized storage and are better for full tool kits, straps, and recovery gear. Pack-of-two options can be a practical choice if you want balanced storage on both sides of the bed.

Steel models tend to emphasize toughness, while aluminum options are often lighter and more corrosion resistant. Black finishes can also help hide scuffs and match modern truck accessories.

Key Buying Factors for Side Mount Truck Bed Tool Boxes

Size and Bed Fit

Measure your truck bed carefully before buying. Check width, depth, and how much space the box will occupy along the side so tailgate use, tonneau covers, and wheel wells are not affected.

Material and Weight

Aluminum is usually the best choice for lighter weight and rust resistance. Steel may be a better fit if you prioritize rigidity and impact resistance, but it can add weight and may need more attention in wet climates.

Security and Weather Resistance

Look for locking latches, keyed access, and seals or weather stripping that help keep contents dry. If you store power tools or paperwork, a tighter lid seal is worth paying attention to.

Mounting and Accessibility

A good side-mount box should open smoothly and remain accessible even when the truck bed is loaded. Consider lid height, hinge design, and whether the box placement will interfere with tie-downs or bed accessories.

Who Should Buy Which Side Mount Truck Bed Tool Boxes?

If you want the lightest, easiest-to-manage option, choose an aluminum box. If you need maximum toughness for heavy daily use, a steel model may be the better fit. For contractors or fleet-style use, larger 48-inch or 60-inch boxes offer more room and organization. For lighter tool storage or smaller trucks, a 34-inch or 36-inch box is often the most practical option.

If you’re comparing multiple setups, Side Mount Truck Bed Tool Boxes with two-box packs can help create a more balanced, organized layout. The right choice comes down to how much gear you carry, how often you access it, and how much bed space you want to preserve.