When you need the absolute maximum in accessible tool storage capacity along your entire truck bed without sacrificing cargo space, the WEATHER GUARD Super Hi-Side Tool Box (Model 391-5-02) represents the ultimate solution in sleek gloss black finish. This premium automotive accessory combines maximum length with super hi-side height and width, delivering an exceptional 15.2 cubic feet of storage—the largest capacity available in bed rail-mounted toolboxes. Mounting on your truck's bed rails along virtually the entire bed length, this super hi-side box keeps your complete bed floor open for lumber, equipment, materials, and cargo while providing unprecedented storage volume for the most extensive tool collections. The contemporary gloss black finish creates a sophisticated, integrated appearance that complements modern trucks while projecting the professional image that reflects quality operations. For commercial operators, fleet managers, contractors with comprehensive equipment requirements, or professionals who demand absolute maximum storage capacity without compromising cargo capability or modern styling, this 90" super hi-side configuration in gloss black represents the pinnacle of truck bed storage solutions.
Ultimate Capacity: 15.2 Cubic Feet of Storage
The 15.2 cubic feet of storage capacity in this super hi-side box represents the absolute maximum available in bed rail-mounted toolboxes—37% more capacity than standard 90" hi-side boxes and nearly double the capacity of standard 64" hi-side models. This exceptional volume is achieved through the combination of maximum 90.25" length, increased 16.25" width, and taller 18" height, creating a super hi-side configuration that accommodates the most extensive tool collections, bulkiest equipment, and largest items that professionals need to transport.
This capacity is transformative for specific operations: contractors managing multiple trades requiring diverse tool sets, fleet vehicles serving as mobile workshops, commercial operations where trucks function as rolling tool cribs, service technicians carrying comprehensive diagnostic and repair equipment, specialty contractors with extensive equipment needs, or any professional whose tool requirements exceed what standard boxes can accommodate. With 15.2 cubic feet, you can store multiple power tool cases, bulky air compressors, paint sprayers, large toolboxes, testing equipment, safety equipment, welding supplies, and extensive hand tool collections—all in accessible bed rail storage that doesn't consume any truck bed floor space.
The exceptionally large door openings—14.75" high by 42" wide on each side—provide outstanding access to the substantial interior. These are the largest doors available, combining the extra height of super hi-side design with the extra width of maximum-length configuration. You can easily load and retrieve bulky items, larger power tools, equipment cases, and toolboxes stored anywhere along the 90" length without awkward maneuvering or repositioning.
Despite this exceptional storage capacity, the bed floor remains completely open. You can still haul full-length lumber, ladders, pipe, steel, sheet goods, pallets, equipment, or any cargo requiring full bed dimensions—the super hi-side box stores tools above and alongside your cargo area rather than competing with it.
Heavy-Duty Aluminum with Professional Gloss Black Finish
The aluminum diamond plate construction is essential for achieving this maximum capacity while maintaining manageable weight. At 85.5 pounds, this represents remarkable engineering—delivering 15.2 cubic feet of storage in a package that two people can handle during installation. A comparable steel box would weigh significantly more and substantially impact payload capacity. Aluminum's natural corrosion resistance ensures decades of reliable service without rust concerns, even in harsh weather, road salt, or chemical exposure.
The Gloss Black ARMOR TUF powder coat finish over the aluminum diamond plate elevates the appearance while providing additional protection against scratches, chemicals, and UV exposure. This contemporary black finish creates a sleek, sophisticated look that coordinates beautifully with black or dark-colored trucks for a cohesive factory-integrated appearance, matches black bed liners and other black accessories for a unified appearance across your entire truck bed setup, and maintains its professional look even with the inevitable wear that occurs in working truck environments. For operators who understand that professional appearance impacts customer perception, business credibility, and competitive positioning—especially with the prominent visibility of a 90" super hi-side box—the gloss black finish delivers both protection and sophisticated styling that makes a strong professional statement and sets your operation apart.
The aluminum door and hinge system is specifically engineered for the demands of super hi-side dimensions and maximum length. The larger, heavier doors require robust construction while maintaining smooth operation and manageable weight. The heavy-duty welded construction and heavy-duty C-channel reinforced lids provide exceptional structural integrity across the full 90" length and increased height, ensuring the box maintains its shape, sealing properties, and security throughout years of demanding commercial use.
Key Features
- Ultimate 15.2 Cu Ft Capacity: Maximum available storage in bed rail design—combines 90" length with super hi-side dimensions
- Extra-Large 14.75" x 42" Doors: Largest available openings for easy loading and access to bulky items throughout interior
- Tool-Less Adjustable Doors: QuickClips allow doors to adjust from 90° to 180° without tools for maximum versatility
- Professional Gloss Black Finish: Contemporary ARMOR TUF powder coat creates sophisticated appearance that complements modern trucks
Advanced Access and Organization
The tool-less adjustable door system using QuickClips provides exceptional versatility that's critical in maximum-capacity configurations. With super hi-side doors extending along the full 90", the ability to adjust each section from 90 degrees to 180 degrees without tools is invaluable. The larger doors benefit even more from this adjustability—configure them for standard access or lay them completely flat for maximum clearance when loading the bulkiest items or working in confined spaces. The tool-free adjustment takes seconds, making it practical to reconfigure throughout the workday based on changing needs, available space, or specific loading requirements.
The removable parts bin keeps small items organized within the substantial 15.2 cubic foot storage space. With maximum capacity distributed along 90", organization becomes essential—the parts bin ensures small items like fasteners, fittings, bits, and frequently accessed parts remain accessible rather than getting lost among larger tools and equipment, maintaining efficiency even with the most comprehensive tool collections.
The convenient attachment point integrated into the box design adds cargo securing capability, creating a comprehensive truck bed organization system that combines maximum storage with practical tie-down functionality along the bed length. This versatile feature allows you to secure ladders, materials, or equipment to the box structure itself.
Security and Weather Protection
The drill-resistant lock core provides crucial protection for the substantial value of tools stored in 15.2 cubic feet of space. The three-point latching system is essential for the super hi-side, maximum-length configuration, securing the larger lids at three locations to prevent prying attempts and maintain proper sealing across the extended dimensions. The multiple latch points ensure security and weather sealing effectiveness throughout the substantial lid area—without three-point latching, the larger lids could be vulnerable at their centers or compromise sealing integrity.
Weather protection is comprehensive across the full 90" length and increased height. The rain gutter channels water away from openings along the entire box, preventing moisture intrusion even during or after rain. The memory-resistant D-shaped ribbed weather stripping maintains effective sealing despite the extended sealing surface and increased lid dimensions, keeping tools dry, preventing rust on steel tools, protecting electronics and precision instruments, and ensuring equipment remains in optimal condition regardless of weather conditions during transport or storage.
Installation and Quality
Installation takes approximately 0.7 hours (about 40 minutes). Despite the maximum capacity and dimensions, bed rail mounting follows proven procedures using included hardware and requiring only basic tools, though assistance is strongly recommended due to the size and weight of this ultimate-capacity configuration. The design is compatible with style-side long-bed trucks—the most common configuration across truck manufacturers.
The Limited Lifetime Warranty demonstrates WEATHER GUARD's confidence in this ultimate-capacity configuration even with maximum dimensions and loads. USA manufacturing ensures the quality control standards, welding procedures, material specifications, and construction methods that have made WEATHER GUARD the professional's choice for commercial operators who depend on their equipment daily. Optional key-alike configuration is available on request for fleet management or operators with multiple WEATHER GUARD products.
Product Specifications
- Box Style: Super Hi-Side Tool Box (Maximum Capacity)
- Material: Aluminum Diamond Plate
- Finish: Gloss Black ARMOR TUF Powder Coat
- Storage Capacity: 15.2 cubic feet
- Mounting Location: Bed Rail
- Opening Type: Double Lid
- Door Size: 14.75" H x 42" W (each side)
- Lock System: 3-Point Latch with Drill-Resistant Core
- Construction: Heavy-Duty Welded
- Lid Construction: Heavy-Duty C-Channel Reinforced
- Weather Strip: Memory-Resistant D-Shaped Ribbed
- Installation Time: 0.7 hours
- Warranty: Limited Lifetime
- Country of Origin: USA
Dimensions:
- Length: 90.25"
- Width: 16.25"
- Height: 18"
- Weight: 85.5 lbs
Key Features:
- Ultimate 15.2 cu ft capacity
- Maximum 90" length
- Super hi-side dimensions
- Extra-large 14.75" x 42" doors
- Tool-less adjustable doors (90° to 180°)
- Removable parts bin
- Convenient attachment point
- Rain gutter and full weather seal
- Three-point latching system
- Drill-resistant lock core
- Gloss black powder coat finish
- USA manufacturing
Compatible With:
- Style-side long-bed trucks
- Bed rail mounting
- Full-size trucks with 8' beds
Ultimate Capacity Meets Ultimate Style
Whether you're a commercial operator requiring mobile workshop capabilities with contemporary styling, a fleet manager seeking maximum storage that projects professionalism and modernity, a multi-trade contractor needing diverse equipment accessible while maintaining sophisticated appearance, a specialty contractor with extensive equipment requirements who values modern aesthetics, a service technician carrying comprehensive diagnostic and repair equipment who refuses to compromise on appearance, or a professional who demands absolute maximum storage capacity without sacrificing cargo space or contemporary styling, the WEATHER GUARD 90" Super Hi-Side Tool Box in Gloss Black delivers the ultimate solution. The combination of 15.2 cubic foot maximum capacity, 90" full-bed coverage, super hi-side dimensions, extra-large doors, innovative adjustable door system, extreme security, comprehensive weather protection, lightweight aluminum construction, and contemporary gloss black finish makes this the definitive choice for the most demanding storage requirements where professional appearance and modern styling are as important as functionality. With USA manufacturing backed by a Limited Lifetime Warranty, this represents the absolute pinnacle of bed rail storage capability—maximum capacity, maximum style, zero compromise.
Terms to Know
- Super Hi-Side Tool Box: An enlarged version of hi-side storage featuring increased width and height for significantly greater capacity while maintaining bed rail mounting that preserves bed floor space.
- Hi-Side Tool Box: A truck storage solution mounting on bed rails to provide storage above the bed floor rather than occupying floor space.
- Bed Rail Mounting: Installation method attaching the toolbox to the top of truck bed side rails without drilling into the bed floor.
- Diamond Plate: Textured aluminum panel featuring raised diamond-shaped patterns providing slip resistance and structural strength.
- Three-Point Latching: Security system where the lid secures at three locations—essential for large super hi-side boxes to maintain security and sealing.
- Drill-Resistant Lock Core: Lock mechanism designed with hardened materials to resist drilling attacks.
- QuickClips: WEATHER GUARD's tool-free adjustment system allowing doors to be repositioned between 90-degree and 180-degree opening angles.
- ARMOR TUF Powder Coat: Durable finishing process creating a tough, chip-resistant, corrosion-proof protective layer.
- Memory-Resistant Weather Stripping: Weather seal material maintaining its original shape and sealing properties through repeated use.
- C-Channel Reinforcement: Structural reinforcement using C-shaped metal channels adding rigidity without excessive weight—critical for large lids.
- Long-Bed Truck: Pickup truck with an extended bed length, typically 8 feet, required for maximum-length 90" toolbox installations.
