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 391-3-02) represents the ultimate solution in professional white 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 bright white ARMOR TUF finish projects the clean, professional image that reflects quality operations and attention to detail. For commercial operators, fleet managers, contractors with comprehensive equipment requirements, or professionals who demand absolute maximum storage capacity without compromising cargo capability or professional appearance, this 90" super hi-side configuration in white 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, municipalities and government fleets, 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, 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, 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 White 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 White ARMOR TUF powder coat finish over the aluminum diamond plate provides both protection and professional appearance. This bright, clean finish maintains professional image, projects quality and attention to detail, improves visibility for safety considerations, reveals any maintenance needs during inspections, and reflects sunlight to help moderate temperature—beneficial for tools and equipment stored inside. The white finish is particularly popular with fleet vehicles, government trucks, municipal operations, and businesses where clean, professional appearance is paramount for public perception and brand image.
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 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 White Finish: Bright ARMOR TUF powder coat projects clean, professional image for quality operations
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. The tool-free adjustment takes seconds, making it practical to reconfigure throughout the workday based on changing needs.
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, and frequently accessed parts remain accessible rather than getting lost among larger tools and equipment.
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.
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.
Weather protection is comprehensive. The rain gutter channels water away from openings along the full 90" length, while memory-resistant D-shaped ribbed weather stripping maintains effective sealing despite the extended sealing surface and increased lid dimensions. This keeps the substantial tool collection dry and equipment protected 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, though assistance is recommended due to size and weight. The design is compatible with style-side long-bed trucks.
The Limited Lifetime Warranty demonstrates WEATHER GUARD's confidence in this ultimate-capacity configuration. USA manufacturing ensures quality control standards that have made WEATHER GUARD the professional's choice for fleets, municipalities, and commercial operators. Optional key-alike configuration is available on request for fleet management.
Product Specifications
- Box Style: Super Hi-Side Tool Box (Maximum Capacity)
- Material: Aluminum Diamond Plate
- Finish: White 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
- Professional white finish
- USA manufacturing
Compatible With:
- Style-side long-bed trucks
- Bed rail mounting
- Full-size trucks with 8' beds
Ultimate Capacity with Professional Image
Whether you're a commercial operator requiring mobile workshop capabilities with professional appearance, a fleet manager seeking maximum storage that projects quality and organization, a municipal operation where public perception matters, a multi-trade contractor needing diverse equipment accessible while maintaining professional image, a government fleet requiring maximum capability with appropriate appearance, or a professional who demands absolute maximum storage capacity without sacrificing cargo space or professional presentation, the WEATHER GUARD 90" Super Hi-Side Tool Box in White 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 professional white finish makes this the definitive choice for the most demanding storage requirements where appearance matters. With USA manufacturing backed by a Limited Lifetime Warranty, this represents the absolute pinnacle of bed rail storage capability—maximum capacity with maximum professionalism.
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.
