10 Best Side Mount Truck Bed Tool Boxes of 2026 for Secure, Easy-Access Storage

Side-mount storage can make a truck bed dramatically more usable by keeping tools organized, protected, and easy to reach from the side.

Below, we’ve rounded up 10 of the best options for 2026, with a focus on fit, durability, security, and everyday convenience.

Best 10 Side Mount Truck Bed Tool Boxes Picks for 2026

Compact Side-Mount Aluminum Storage – 36-Inch Black Truck Toolbox

If you want side mount truck bed tool boxes that keep the bed floor open, this 36-inch aluminum model is built for straightforward storage and quick access. The side-mount design sits on the truck side rails, while the weatherproof seal, keyed lock, and gas strut help make everyday hauling more practical.

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

Pros:

• Heavy-duty 0.058-inch aluminum construction for durable, space-saving storage
• Side-mount layout leaves more room in the truck bed for cargo
• Weatherproof seal and lockable latch help protect contents
• Gas strut supports smooth lid opening and 90-degree access

Cons:

• At 36 inches long, it offers less capacity than larger topsider-style boxes
• Single-compartment layout may not suit users who want organized internal divisions

Overall, this is a solid choice if you need a basic, durable side mount box that prioritizes bed space and easy access. It’s especially appealing for users who carry tools, chains, or camping supplies without needing a massive cabinet.

Full-Width Topsider Cabinet – 72-Inch Aluminum Truck Box

Among side mount truck bed tool boxes, this 72-inch topsider stands out when you need maximum storage and easy dual-door access. The .100-inch diamond tread aluminum construction, no-drill mounting hardware, and weather-resistant latching make it a practical option for jobsite storage and everyday hauling.

Best For: Contractors and truck owners who need a wide, weather-resistant topsider with easy access from both doors.

Pros:

• .100-inch-thick diamond tread aluminum for rugged, corrosion-resistant storage
• Dual recessed drop doors provide broad access across the cabinet
• Locking compression latches help keep gear secure and help compress door seals
• Includes J-hook mounting hardware for no-drill installation

Cons:

• Large 72-inch size may be too wide for smaller truck setups
• Weight and footprint make fitment checks important before mounting

If you want a full-length topsider with serious capacity, this model is aimed at users who need organized, weather-resistant storage rather than a minimal tool box. Its size and dual-door layout make it especially useful for work trucks carrying frequent-access gear.

Heavy-Duty Steel Side Mount – 34-Inch Locking Truck Box

This side mount truck bed tool box is designed for buyers who want steel construction and a larger storage cavity without giving up bed-floor space. With dual powder coating, a keyed lock, and dual gas struts, it focuses on durability, security, and convenient side access for work or travel.

Best For: Truck and RV owners who want a rugged steel side box with secure locking and easy one-handed access.

Pros:

• Heavy-duty steel body with dual powder-coated finish for rust and corrosion resistance
• Side-facing design keeps the bed floor clear for larger cargo
• Stainless steel locking latch with two keys for secure storage
• Dual gas struts support smooth, one-handed opening and closing

Cons:

• Steel construction is heavier than aluminum alternatives
• Only one size is listed in the notes, so fit flexibility may be limited

For users who value toughness and a more substantial feel, this box offers a practical mix of security and accessibility. It’s a strong fit for frequent work use, towing gear, or camping equipment that needs reliable protection.

Matte Black Side-Mount Utility – 48-Inch Aluminum Truck Box

If you’re comparing side mount truck bed tool boxes for a balance of size and durability, this 48-inch aluminum model is a straightforward option. It uses rust-resistant diamond treadplate construction, a weather-resistant lid seal, and premium shocks to make access easier while keeping tools protected from dirt and moisture.

Best For: Users who want a mid-size side-mount aluminum box with a clean matte black finish and easy lid support.

Pros:

• Rust-resistant diamond treadplate aluminum construction
• Weather-resistant seal helps block dirt and moisture
• Premium shocks and a metal reinforced lid brace improve lid support
• No assembly required for simpler setup

Cons:

• At 48 inches wide, it may still require careful truck-bed fit checks
• Latch-based closure may be less advanced than keyed lock setups

This is a good middle-ground pick if you want a longer box than the compact 36-inch options but don’t need a massive topsider cabinet. The matte black finish and reinforced lid details make it practical for everyday utility use.

Compact Side Rail Access – 36 Inch Black Aluminum Side Mount Box

If you want side mount truck bed tool boxes that keep your cargo area open, this 36-inch aluminum model is a compact, practical option. The bed rail-mounted design gives you truck-side access, while the welded one-piece tub and weather strips add useful everyday durability.

Best For: Drivers who want a shorter side-mounted box for easier access without giving up too much bed space.

Pros:

• Bed rail-mounted design makes tools easy to reach from the truck side
• Welded 0.058-inch aluminum tub for sturdy construction
• Lockable push-button handle adds convenience and security
• Compact 36-inch size is easier to fit in smaller bed setups

Cons:

• Not water resistant, so it is not meant for full waterproof protection
• Shorter length means less storage capacity than the 48-inch and 60-inch versions

This is a solid pick if your priority is side access and a lower-profile footprint rather than maximum storage volume. It suits buyers who want a simple, secure aluminum box for tools and everyday truck organization.

Long-Haul Storage – 60 Inch Silver Side Mount Truck Box

Among side mount truck bed tool boxes, this 60-inch aluminum model is built for buyers who want more length and a straightforward side-access layout. The bed rail-mounted design helps preserve usable bed space, and the lockable push-button handle adds practical security for stored tools.

Best For: Truck owners who need a longer side-mounted box and want easy access from the side of the bed.

Pros:

• 60-inch size offers more storage room than the shorter options
• Bed rail-mounted Lo-Sider design keeps the center of the bed open
• Welded 0.058-inch aluminum construction for durability
• Includes 2 keys and a lockable push-button handle

Cons:

• Not water resistant, despite being listed as weathertight
• Longer box may be less suitable for tighter truck bed setups

If you want a bigger side-mounted storage solution, this model gives you the longer format many buyers look for. It is a practical choice for hauling tools while keeping access convenient and bed space usable.

Heavy-Duty Weather Shield – 60 Inch Black Tread Aluminum Box

If you need side mount truck bed tool boxes with a tougher look and broader use beyond a pickup bed, this 60-inch black aluminum box is worth a close look. It uses textured aluminum with a 5-bar tread pattern, a keyed lock, and a compact side-mount layout designed to save space.

Best For: Buyers who want a weatherproof, keyed side-mount box for trucks, trailers, and multi-vehicle use.

Pros:

• Textured aluminum with 5-bar tread is built for durability and corrosion resistance
• Waterproof construction offers stronger weather protection than the other options here
• Side-mount layout helps maximize usable truck bed space
• Versatile enough for trucks, trailers, RVs, ATVs, and job sites

Cons:

• At 60 inches long, it takes up significant side space
• Maximum weight recommendation is listed at 100 kg

This model stands out if weather resistance and a more rugged finish matter most. It is a good fit for buyers who want a lockable storage box that can move between different work and travel setups.

Dual 60-Inch Storage – 60 Inch Aluminum Side Mount Tool Box 2 Pack

If you want side mount truck bed tool boxes that maximize length without eating up bed space, this 2-pack of 60-inch aluminum boxes is built for that layout. The side-mount design sits on the truck side rails, and the large 60 x 13 x 14-inch size gives you room for tools, hardware, and even camping gear.

Best For: Truck owners who want long, rail-mounted storage with secure locking and a weather-resistant aluminum build.

Pros:

• Side mount design keeps the center of the truck bed open for other cargo.
• Heavy-duty 0.058-inch aluminum construction with a weatherproof seal line.
• Built-in lock and stainless steel locking latch add security.
• Gas strut lid opens smoothly to 90 degrees for easier loading.

Cons:

• No mounting accessories are included.
• The 2-pack may be more storage than some trucks need.

Overall, this is a practical choice if you need long, durable storage boxes that mount along the bed sides and help keep your truck organized without sacrificing open cargo space.

Low-Profile Trailer Box – 60 Inch Aluminum Side Mount Tool Box

This side-mount truck bed tool box is aimed at buyers who want a slim profile but still need a full-length storage solution. At 60 x 8 x 14 inches, it works well when you want organized storage for a truck, RV, trailer, or enclosed rig without taking up as much width.

Best For: Narrower mounting spaces on trailers, RVs, or truck beds where a long, lightweight aluminum box makes sense.

Pros:

• Slender 8-inch width makes it easier to fit in tighter spaces.
• Powdercoated black aluminum with a 5-bar tread pattern for added durability.
• Weather-resistant overlapping lid and seal ring help keep contents protected.
• Lock and keys provide basic security for stored items.

Cons:

• The listed weight is 84 pounds, so handling may take effort.
• Product notes mention both 2 keys and 4 keys, which may be confusing.

For users who need a long but narrow box, this model offers a useful balance of storage, weather resistance, and versatile mounting options across trucks and trailers.

Compact Rail Storage – 36 Inch Side Mount Tool Box 2 Pack

For shoppers comparing side mount truck bed tool boxes in a smaller size, this 36-inch 2-pack is a compact option that still gives you dedicated storage on the bed rail. The welded aluminum one-piece tub is designed to be lightweight, sturdy, and weatherproof while keeping access simple from the truck side.

Best For: Smaller trucks or buyers who want a lighter, compact side-mount storage setup in a two-box package.

Pros:

• Compact 36 x 12 x 12-inch size works well when space is limited.
• Welded 0.058-inch aluminum one-piece tub is lightweight and sturdy.
• Lockable handle adds security and easier access.
• 90-degree lid opening makes loading and unloading simpler.

Cons:

• Smaller capacity than the 60-inch options.
• Only one compartment per box.

This is a sensible choice if you want a lighter, more compact rail-mounted setup and do not need the extra length of a full-size side box.

How We Picked the Best Side Mount Truck Bed Tool Boxes

We prioritized practical buying factors that matter most in daily use: size options, build material, locking security, weather protection, installation fit, and overall storage efficiency. We also looked for models that work well in truck beds, trailers, and RV setups, since many buyers need flexible utility beyond a single vehicle.

Because Side Mount Truck Bed Tool Boxes sit along the bed rail, we gave extra weight to low-profile designs that preserve cargo space while still offering easy side access.

Quick Comparison

In general, shorter boxes are better for compact trucks and tighter bed layouts, while 60-inch and larger options suit users who carry more hand tools, recovery gear, or jobsite equipment. Aluminum boxes are the most common choice because they balance weight and corrosion resistance, while lockable lids and weather seals help protect contents from theft and the elements.

Key Buying Factors for Side Mount Truck Bed Tool Boxes

Size and Bed Compatibility

Measure your bed length, rail height, and clearance around wheel wells before buying. A box that is too tall or too deep can interfere with cargo, tonneau covers, or trailer clearance.

Material and Durability

Most buyers should look for aluminum construction because it is lightweight and resistant to rust. Tread patterns, reinforced lids, and solid hinges are helpful if the box will see frequent use on rough roads.

Security and Weather Protection

Choose a model with a dependable lock, sturdy latch, and included keys. Weather stripping and tight lid closure matter if you store power tools, recovery gear, or documents that need to stay dry.

Access and Layout

Side-access boxes are ideal when you want to reach tools without climbing into the bed. Think about whether you need a single box, a pair, or a longer layout that spreads storage across the truck or trailer side.

Who Should Buy Which Side Mount Truck Bed Tool Boxes?

If you need compact storage for light-duty tools, a 36-inch box is often the easiest fit. Contractors, haulers, and anyone carrying larger gear may prefer 48-inch or 60-inch options for more usable volume. Buyers who want maximum organization across both sides of the bed should consider a two-pack. If your priority is all-weather, lockable storage with simple access, Side Mount Truck Bed Tool Boxes are a smart upgrade for work and travel alike.