Loading and securing a roof box correctly

2. Packing the roof box correctly – weight distribution is crucial

A roof box is perfect for bulky but light luggage. Heavy suitcases, tools or crates of drinks, on the other hand, belong in the boot! How to pack correctly:

• Always stow heavy items in the centre and as low down as possible.
• Light and soft items such as clothing, sleeping bags or blankets should be placed on top.
• It is important to distribute the weight evenly so that the vehicle remains stable.

4. Handling with a loaded roof box

A fully loaded roof box noticeably changes the handling of your vehicle. The higher centre of gravity makes the vehicle less stable in corners, increases braking distances and makes it more sensitive to crosswinds. You should therefore adjust your speed accordingly and not exceed the maximum speed recommended by the manufacturer, which is usually 120 to 130 km/h.

Frequently asked questions and answers

What can (and should) be placed in the roof box?

Lightweight and bulky items that do not have a large mass are stored in a roof box. These include, among other things:

• Jackets, blankets, sleeping bags
• Shoes, lightweight bags, sleeping mats
• Children's clothing or soft toys
• Ski equipment, provided that the roof box is approved for this purpose and the skis are securely fastened in the roof box with tensioning systems to prevent them from slipping.

What should not be transported in a roof box?

No hazardous substances, such as flammable liquids or explosive materials, may be transported in a roof box.

Why should heavy items not be placed in the roof box?

Many people like to put heavy and bulky items such as prams in the roof box. However, this is not a good idea. A heavy roof box poses the following safety risks:

• Driving dynamics: Heavy weight on the roof raises the vehicle's centre of gravity. Cornering stability decreases and braking distances become longer.
• Load on roof racks: Most roof boxes are only designed for a maximum total weight of 50–75 kg (including the box). This includes the rack, box and contents.
• Risk of accident: In the event of emergency braking or a collision, heavy objects in the roof box can become projectiles. The fastening points are not designed for this.
• Wind sensitivity: An overloaded roof box impairs aerodynamics, increases air resistance and can be dangerous in strong crosswinds.

How should you load the roof box? Tips!

To ensure stability while driving, slightly heavier items should be placed in the centre of the box and, if possible, above the vehicle's longitudinal axis. Lightweight items should be placed towards the outside or at the ends of the box. Bulky or fragile items should be well padded to prevent damage to the roof box and other luggage.

When should the roof box be additionally secured with a tension strap?

To ensure that a roof box is securely and stably mounted, the roof rack, base rack and box must be optimally matched to each other. Only when all components fit together can it be guaranteed that the roof box will remain firmly attached to the vehicle even at higher speeds, during braking manoeuvres or in crosswinds. In certain situations, however, it may also be advisable to secure the roof box with an additional tension strap. This applies in particular:

• with a fully loaded roof box,
• on long journeys or winding roads,
• in strong crosswinds or at high speeds,
• if the roof box or mounting system is already older.

How can you secure a roof box even more?

1. Use UV-resistant, abrasion-resistant tension straps with ratchet or clamp fasteners.
2. The strap should be placed over the roof box and the roof rack system.
3. Tighten the strap firmly, but not excessively. A strap that is too tight can deform the box or its fastening.
4. Place foam, felt or a soft cloth under the contact points to prevent scratches on the vehicle roof or box.
5. Tuck away any protruding strap ends or secure them with knots to prevent flapping.
6. Tuck away any protruding strap ends or secure them with knots to prevent flapping.

Can you load a roof box with suitcases?

Yes, but only with lightweight suitcases. Heavy or hard suitcases should be stored in the boot for safety reasons. Soft travel bags or fabric suitcases are ideal for the roof box – they fit better, can be secured more safely and distribute the weight evenly.

Loading skis into a roof box – what do you need to bear in mind?

To transport ski equipment safely in a roof box, it should be secured and fastened with tension straps. This prevents it from slipping during the journey. To ensure even weight distribution, the skis should be placed in the centre. Make sure they are firmly wedged between other items to minimise movement during the journey.

How do you best pack the roof box for a skiing holiday?

Stow the heaviest items first

• Place skis and ski poles centrally over the longitudinal axis of the vehicle.
• Secure with the supplied tension straps or fastening systems.
• Bindings as low as possible to lower the centre of gravity

Then lighter objects

• Ski boots (in cloth bags)
• Helmets, gloves, ski goggles (in bags or soft pouches)
• Thick winter jackets and ski trousers (as padding between items)

Finally, pad and secure

• Fill gaps with blankets or soft clothing
• Secure everything with straps or retaining clips.
• The lid should close easily without any pressure.

Do not place tools or snow chains in the roof box – they are too heavy or may come loose. They belong in the boot.