Roof Box · Ultra-Thin Lengthened / Flagship
Xtreme RoamForce 500L Ultra-Thin Lengthened Roof Cargo Box
Item No: XR-RB500L
500L of lockable cargo in an ultra-thin, garage-friendly shell.
The Xtreme RoamForce 500L Ultra-Thin Lengthened Cargo Box is built for long-range athletes and expeditionists — 500 litres of internal volume in a ~30 cm ultra-thin silhouette. Reinforced ABS + Polycarbonate shell, dual-side gas-strut opening, 3-point central multi-lock and a Quick-Grip U-bolt fitting that mounts to virtually any crossbar. Fits skis, rods and full golf sets up to 200 cm, and slides forward or back on universal tracks so it never fouls the rear hatch or sunroof.
- 500 L internal volume
- ~206 cm exterior length (lengthened)
- ~30 cm ultra-thin profile
- Reinforced ABS + PC composite, UV-stabilised
- Dual-side opening with gas-strut support
- 3-point central multi-lock
- Quick-Grip universal U-bolt fitting
- Load capacity 75 kg / net weight ~20 kg
Features
Engineered, not assembled.
Sport-Ready Length
Internal length optimised for gear up to 200 cm — skis, rods, and full golf sets.
Aero-Thin Profile
~30 cm closed height cuts drag and keeps the vehicle under standard 2.1 m garage limits.
Hybrid ABS+PC Shell
Polycarbonate flex absorbs impacts; high-density ABS holds shape from -25 °C to +60 °C.
Dual-Side Access
Gas-strut opening from either side — critical in tight campsites and city streets.
Specifications
Technical data.
Materials & construction
- Shell: Reinforced ABS + PC composite (UV stabilised)
- Seal: Automotive-grade EPDM gasket, overhanging lid design
- Lock: 3-point central multi-lock with steel-reinforced channels
- Mounting: Quick-Grip universal U-bolt (fits standard crossbars)
Customisation options
Colour / Finish: Carbon-Fibre Texture
Final colour, trim and private-label branding confirmed at order — MOQ and lead-time on request.
Inquiry
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Description
More about 500L Ultra-Thin Lengthened.
Introduction: Zero Limits, Maximum Storage
Overlanding often forces a difficult choice: take the gear you need, or maintain the aerodynamics and clearance of your vehicle. The Xtreme RoamForce 500L Ultra-Thin Lengthened Cargo Box eliminates that compromise. Specifically engineered for modern SUVs like the Toyota RAV4 and Mazda CX-30, this premium cargo solution combines an expansive 500-liter volume with a sleek, low-profile silhouette. Whether you're transporting high-performance skis, fishing rods, or a full set of golf clubs, the "Lengthened" series provides the specialised length required for professional gear while keeping your vehicle's total height manageable for standard parking garages.
Engineering the Length: Beyond the Standard Footprint
While standard boxes are excellent for general luggage, the Lengthened Series is built for the long-range athlete and expeditionist.
- Sport-Ready Capacity: Internal length optimised for gear up to 200 cm — the ultimate companion for winter sports and coastal fishing trips.
- Vehicle-Specific Optimisation: Designed to complement the rooflines of popular crossovers so the box doesn't overhang the windshield or interfere with the rear antenna.
- Dual-Side Accessibility: Regardless of the length, loading stays effortless. The dual-side opening system, supported by high-performance gas struts, lets you access gear from either the driver or passenger side — critical in narrow campsites or busy city streets.
Aero-Thin Profile: Silent and Efficient
Height is the enemy of both fuel economy and garage access. The Xtreme RoamForce Ultra-Thin series is among the slimmest 500L boxes on the market.
- Low-Drag Silhouette: With a closed height of just ~30 cm, this box minimises the "parachute effect" at highway speeds, saving up to 6% in fuel costs compared to taller, boxier alternatives.
- Stealth Performance: Precision-molded vortex generators on the nose and base channel airflow smoothly, reducing wind whistle to a whisper-quiet level even at 70+ mph.
- Garage-Friendly: Maintains access to standard multi-story parking garages (2.1 m limit) even with the box mounted on most factory roof racks.
Hybrid Shell Integrity: The ABS+PC Shield
We use a high-grade ABS + Polycarbonate (PC) Composite so this box survives the abrasive reality of the trail.
- Impact Resilience: PC infusion provides the flex needed to absorb rock strikes and highway vibrations without cracking, while the high-density ABS holds structural rigidity under full load.
- Temperature Stability: Engineered to perform from -25 °C to +60 °C — stable and easy to operate whether in sub-zero Alpine passes or sun-drenched Outback plains.
- Advanced Locking Security: A 3-point central locking system with steel-reinforced lock channels turns the box into a high-security vault for expensive sporting equipment.
Frequently Asked Questions (FAQ)
Q: Can I fit 200 cm skis inside this box?
A: Yes. The Lengthened Edition is specifically designed for long-item transport. Most skis up to 200 cm (depending on binding height) fit comfortably within the internal cavity.
Q: Will the box interfere with my SUV's rear hatch or sunroof?
A: No. The universal mounting tracks let you slide the box forward or backward for full clearance to the rear hatch and antenna. The ultra-thin profile also keeps the sunroof functional with a clear view.
Q: Is this box waterproof?
A: The Xtreme RoamForce cargo box is highly water-resistant. It features an overhanging lid design and an automotive-grade EPDM gasket that keeps rain, dust, and road spray away from your gear. Not submersible, but fully protective during heavy storms and high-speed transit.
Carry More. Profile Less.
The Xtreme RoamForce 500L Ultra-Thin Lengthened Cargo Box: Engineered for the Long Journey Ahead.