The complete guide to 4WD roof storage: bars, racks, platforms and boxes explained

Selecting the right roof storage for your 4WD can significantly influence how you pack your gear, improve accessibility, and ensure safe handling. Here’s a summary of the main roof storage options – roof bars, racks, platforms, and roof boxes – along with their benefits and drawbacks, load limits, and where to buy them.

But first, let’s talk about your 4WD’s roof load rating

Before we discuss roof storage solutions for your 4WD, it’s important to understand the difference between dynamic and static load and where to find your 4WD’s roof load rating.

Dynamic load refers to the weight the roof storage solution can handle while the vehicle is in motion. This weight is typically lower than the static load due to the additional forces acting on the roof while driving.

On the other hand, the static load is the weight that the roof storage solution can support when the vehicle is stationary. This load can be 2-3 times higher than the dynamic load, although the exact ratio depends on the vehicle and storage system.

Your 4WD owner’s manual will specify the maximum weight your roof can accommodate. Additionally, some vehicles may have labels on the roof rails or door jambs. It’s important to note that roof load ratings can vary significantly among different vehicle models. For example, most 4WD roofs can handle up to 100kg, with a few exceptions rated at 120kg.

4WD roof storage manufacturers specify a load capacity for their products, and adhering to these limits is crucial. These ratings can be different for on-road and off-road conditions, with off-road ratings often being lower than on-road ratings. It can be challenging to locate these specifications, as it is often hidden in the fine print.

Let’s dive into the main 4WD roof storage options

#1. Roof bars

Roof bars, often called cross bars or load bars, serve as the foundation for various 4WD roof storage systems. They consist of two or more bars mounted on the roof, either using existing mounting points or clamp-style attachments.

Load capacity

• Typical dynamic load capacity per bar: 50–150 kg.
• Static load capacity per bar: Up to 300 kg (if supported by mounting points).

Typical uses of  roof bars:

• Bike mounts: Ensures secure and upright positioning.
• Kayak/ski carriers: Offers padded and locking options.
• Roof boxes: Easily attach to roof bars.
• Rooftop tents: Preferred method for mounting rooftop tents.

Performance considerations

• Wind noise: Some bars have front extrusions that cause wind noise or whistling.
• Fuel efficiency: Anticipate a reduction in fuel efficiency with roof bars installed.
• Handling impact: Minimal when lightly loaded, but noticeable if overloaded.

#2. Roof racks

Roof racks are often regarded as the ideal solution for 4WD rooftop storage. They provide a versatile and convenient platform for carrying various items, such as storage boxes, jerry cans, LPG bottles, and bulky gear. They also allow easy access to stored items and help declutter the vehicle’s interior.

Types of roof racks:

• Raised rail racks: Attaches to factory-fitted rails on the roof.
• Flush rail racks: Attaches to flush-mounted rails for a cleaner look.
• Track mount racks: Installed into the roof channels for a more secure fit.
• Clamp-on racks: Attaches to the roof gutter; ideal for vehicles lacking rails or tracks.

Materials

• Aluminium: Lightweight and corrosion-resistant.
• Steel: Stronger but heavier and more prone to rust if not properly coated.

Load capacity

• Typical dynamic load capacity: 50–100 kg.
• Static load capacity: Up to 300 kg (depending on the mounting points).

Best accessories for roof racks:

• Awning mounts: Quick-deploy shade solutions.
• Shovel/jack holders: Keep recovery gear accessible.
• Jerry can holders: For extra fuel or water storage.
• Light bars & spotlights: Easy to mount and wire.

Performance considerations

• Wind noise: Some racks use wind deflectors to reduce wind noise.
• Fuel efficiency: Anticipate a reduction in fuel efficiency.
• Handling impact: Minimal when lightly loaded, but noticeable if overloaded, especially when driving an off-camber section of track.

#3. Roof platforms

Roof platforms are a rugged and versatile 4WD roof storage solution that create a flat, stable base for mounting various gear and accessories. They’re a popular choice for serious off-roaders and overlanders.

Types of roof platforms

• Full-length platforms: Extends the full length of the roof, offering maximum storage.
• Half-length platforms: Covers only part of the roof, leaving room for a roof box or other gear.
• Modular platforms: Allows you to add or remove sections depending on your needs.

Materials

• Aluminium: Lightweight and corrosion-resistant.
• Steel: Stronger but heavier and more prone to rust if not properly coated.

Load capacity

• Typical dynamic load capacity: 100–150 kg.
• Static load capacity: Up to 400 kg (great for roof-top tents).

Best accessories for roof platforms

• Awning mounts: Quick-deploy shade solutions.
• Shovel/jack holders: Keep recovery gear accessible.
• Jerry can holders: For extra fuel or water storage.
• Light bars & spotlights: Easy to mount and wire.

Performance considerations

• Wind noise & drag: Platforms create more drag, but low-profile designs and wind deflectors reduce this.
• Fuel efficiency: Expect a 10–15% reduction in fuel economy.
• Handling impact: The higher centre of gravity affects cornering and side angles.

#4. Roof boxes

4WD roof boxes are a fully enclosed roof storage solution and are designed for easy loading and unloading. They come in different shapes and sizes to match specific needs.

Types of roof boxes

• Side-opening: Easier to access from the side of the vehicle.
• Dual-side opening: Opens from either side for convenience.
• Rear-opening: Great for hatchbacks and SUVs with limited side access.

Materials

• ABS plastic: Lightweight, UV-resistant, and impact-resistant.
• Fibreglass: Lighter than plastic but more prone to cracking.

Load capacity

• Typical dynamic load capacity: 50–75 kg
• Static load capacity: N/A (designed only for driving loads)

Best accessories for roof boxes

• Internal straps: Keep gear secure inside the box. 
• Quick-release mounts: Fast attachment/removal.
• Locking systems: High-quality locks for security.

Performance considerations

• Wind noise & drag: Aerodynamic designs minimise noise and fuel impact.
• Fuel efficiency: Expect a 5–10% reduction depending on the size and shape.
• Handling impact: Minimal unless overloaded.

A few things to consider when it comes to 4×4 roof storage

Mounting systems – strength matters

How you mount your 4WD roof storage system affects load capacity and safety.

Factory rails/tracks

• Strong, reliable mounting points for racks and platforms.
• Check the manufacturer’s rated load capacity.

Gutter mounts

• Common on older 4x4s (e.g., Land Cruiser, Patrol).
• High load capacity but requires drilling or special brackets.

Clamp-on mounts

• Easy to install, but may loosen over time on rough roads.
• Best for lighter loads and occasional use.

Direct-to-roof mounts

• Permanent solution requiring drilling.
• It’s the strongest option, but it limits flexibility for removal.
• Holes must be sealed to prevent moisture from entering the internal roof space.

Load distribution – balance is key

Carrying heavy loads up top affects your 4WD’s centre of gravity and handling.

Best practices

• Keep heavy items low: Place heavy gear closer to the roofline and near the centre of the vehicle.
• Secure items properly: Use ratchet straps or tie-down straps to prevent shifting.
• Watch roof clearance: Remember the extra height when entering car parks and low-clearance areas.
• Even weight distribution: Avoid loading one side more heavily than the other.

Who sells what 4×4 roof storage solutions?

	Roof Bars	Roof Racks	Roof Platforms	Roof Boxes	Mounting Kits	Accessories
4WD Supacentre	🟢	🟢	🟢		🟢	🟢
Anaconda	🟢		🟢	🟢	🟢	🟢
Aussie Offroad 4×4	🟢	🟢	🟢	🟢	🟢	🟢
ARB 4×4 Accessories	🟢	🟢				🟢
BCF	🟢		🟢	🟢	🟢	🟢
CaravanRVCamping	🟢	🟢			🟢
Front Runner	🟢	🟢			🟢	🟢
Ironman 4×4	🟢	🟢			🟢
Kaon					🟢	🟢
Ocam 4×4 Accessories	🟢	🟢	🟢	🟢		🟢
Opposite Lock	🟢	🟢	🟢		🟢	🟢
Outback Equipment	🟢	🟢	🟢	🟢	🟢	🟢
Pirate Camp Co.	🟢		🟢
Prorack Australia	🟢	🟢	🟢	🟢	🟢	🟢
Rhino-Rack	🟢	🟢	🟢	🟢	🟢	🟢
Rola	🟢	🟢	🟢		🟢	🟢
Roof Rack World	🟢	🟢	🟢	🟢	🟢	🟢
SCFabworks		🟢
TC Boxes		🟢				🟢
Thule	🟢	🟢	🟢	🟢	🟢	🟢
Tracklander	🟢	🟢			🟢	🟢
TrailMax		🟢				🟢
Quick Pitch Australia	🟢	🟢			🟢	🟢
Yakima	🟢		🟢	🟢	🟢	🟢

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