Are you driving with a rooftop tent or other roof cargo? If so, it needs to be safe. In this blog, you’ll read about what roof loads are, how to calculate your roof load and what to watch out for with roof loads.
What is roof load?
Roof load is what your car is allowed to carry on the roof while driving. This is called the dynamic roof load. Statically (stationary) the roof is allowed to handle more, which is why you can sleep in a rooftop tent.
Dynamic vs. static
Driving forces work on your roof (braking, turns, bumps, wind). Therefore, the dynamic value is low. Stationary, the roof is allowed to carry more. In practice, this is often a multiple of the dynamic value, but consider this a rule of thumb, not a guarantee. Manufacturers rarely specify a static value. So sleep on a flat surface and put your car down in a stable position.
Here’s how to check your set-up
Determine the dynamic roof load of your car. Add the actual weight of: roof racks + roof tent + ladder + accessories.
Are you close to the limit? Choose lighter, leave accessories in the car or move weight inside. Lots of miles and frequent mounting and dismounting? A hardcover roof tent is quieter and faster. If your structural height is too high, a roof tent on trailer is often the smartest solution. If you drive a bus or camper, check if your carriers and mounting points can handle heavier loads.
Important points to consider when determining roof loads
- Check roof type: open/flush rails, fixpoints or smooth roof. This will determine your carriers and mounting.
- Panoramic roof/glass: not every car with a glass roof is suitable. Check the manual or ask the dealer.
- Carrying capacity of carriers: counts in your sum. Take the actual weight of carriers and feet.
- Carrier spacing: ideally 80-110 cm. Too close together is less stable.
- Sum with margin: carriers + roof tent + ladder + accessories ≤ dynamic roof load. Keep 5-10 kg slack.
- Distribute weight: plan now where heavy items will go (preferably low, in the car).
Choose the right rooftop tent for your roof load
Want to see immediately which setup fits your car and roof load? Check out our complete overview of roof tentsChoose for fast and silent driving with a hardcover roof tentor go for extra sleeping space with roof tents 4 persons. Do you have questions about weight, carriers or mounting? Send us a picture of your roof; we’ll think with you.
