Before you can safely use a cargo box, you need to learn the best positioning.

If the cargo box isn’t positioned correctly, you could face several issues later, including damage to the box and a higher risk of accidents.

Where Do You Mount the Cargo Box on the Roof Rack?

Ideally, the cargo box should be positioned in the center of the roof rack. However, balancing it can become slightly harder as you load more into the carrier. Distribute the weight evenly throughout the cargo box.

When mounting the cargo box, ensure it sits centrally on the rack. The clamps should be set so that the box is facing the vehicle’s hood. The narrow side of the box should face the front, not the other way around.

Weight Balance is Important

When positioning the rooftop cargo carrier, consider the vehicle’s center of gravity. The front of the vehicle is heavier as it contains the engine and other mechanical components.

Pack the roof box so that heavy items are placed in the bottom and center.

The weight limit of a cargo box typically ranges between 75 and 165 pounds. Always be mindful of your model’s weight limit and stay below that. As the saying goes, “Better safe than sorry.”

Position of the Roof Box and Its Impact

As mentioned above, the ideal position is in the middle of the vehicle. Some people may position the box based on convenience, but this can affect performance.

For short journeys, improper positioning may not have much impact, but on longer trips, incorrect placement can significantly affect the vehicle’s performance and fuel economy.

At the Front

Positioning the cargo box too far forward can destabilize the vehicle and negatively affect aerodynamics, leading to reduced fuel efficiency. The front windshield will interfere with airflow, further impacting fuel economy.

Towards the Back

Placing the roof box towards the rear can make it difficult to open the trunk, especially for SUVs. You may find yourself unable to access your luggage unless you stop to reposition the box.

On One Side

Mounting the roof box to one side may make loading and unloading easier, but it can cause poor weight distribution, which could affect driving stability.

Ideal Position: In the Middle

Positioning the roof cargo box in the middle of the vehicle helps to ensure proper weight distribution, stability, and aerodynamics.

Mounting the Cargo Box

1. Ensure your vehicle has a roof rack or crossbars installed, as the cargo box attaches to these.
2. Place the cargo box on top of the roof rack or crossbars. Center it to ensure even weight distribution. Adjust it so that it's not too far forward (which may obstruct your view) or too far back (which might block access to the trunk).
3. Open the cargo box to access the mounting points or clamps. Adjust the crossbars if necessary so they align with the mounting points of the cargo box.
4. Depending on the model, your cargo box may come with U-bolts, clamps, or mounting brackets. Attach these through the holes or channels at the bottom of the box and around the crossbars. Tighten the mounting hardware using a wrench, screwdriver, or knobs, but don’t over-tighten, as this could damage the box or crossbars.
5. After tightening, wiggle the box to ensure it’s firmly attached. There should be no wobbling or movement. Ensure all mounting points are secure.
6. If your cargo box has a lock, ensure it’s locked before driving.
7. Make sure the cargo box does not interfere with the vehicle’s operation (e.g., sunroof, rear hatch). Double-check its alignment and fastening.
8. Take a short test drive, listening for unusual noises or vibrations. Re-check the hardware afterward to ensure it’s still tight.

How to Load a Cargo Box Properly

1. Open the cargo box as far as it will go and lock it in place so it doesn’t slam shut while you’re loading cargo.
2. Load the heaviest items first (e.g., suitcases, golf clubs).
3. Add smaller items next, filling gaps to prevent cargo from shifting. Aim for even weight distribution across the front, rear, and sides.
4. Use towels or other padding around delicate items to prevent damage.
5. Secure the cargo with the provided straps or bungee cords.
6. Close and lock the cargo box.

Checking the Cargo Box Installation

After packing and securing everything, do a final “wiggle test” to ensure nothing has shifted.

If time allows, take another short test drive to verify that there are no unusual noises or visibility issues.

Things to Remember

Always verify the overall weight limit of your cargo box before use. This information is typically found in the owner’s manual or on the manufacturer’s website.

Overloading the box is risky and increases the chance of accidents. Additionally, certain items should never be stored in a roof box, such as explosives, hazardous chemicals, animals, liquids, flammable items, or anything sensitive to extreme temperatures.

If you're looking for a roof top cargo box for your next adventure, Enthuze has you covered with five cargo boxes to choose from. Enthuze also has portable refrigerators, roof top tents and bike racks for the next time you’re heading out into the great outdoors.

 

Related articles: 

• What is the Weight Limit of a Roof Cargo Carrier?
• What Size Cargo Box Do I Need?
• Rooftop Cargo Box Q&A
• A Look at Enthuze Cargo Boxes