Can My Car Support a Rooftop Tent? Roof Load Ratings

A dynamic roof load rating is the maximum amount of weight your vehicle's roof can safely carry while the vehicle is moving. This includes the forces generated by:

• Braking

• Accelerating

• Cornering

• Wind resistance

• Bumps and potholes

• Corrugated gravel roads

When your vehicle is travelling, the weight on the roof is subjected to far greater forces than when parked. A rooftop tent weighing 70kg may briefly exert significantly more force on the roof rack system when travelling over rough terrain or during emergency manoeuvres. This is why dynamic load ratings are often lower than people expect.

What Counts Towards Dynamic Roof Load?

Your dynamic load includes:

• Rooftop tent weight

• Roof rack or platform weight

• Mounting hardware

• Awnings

• Recovery gear mounted to the roof

• Any other accessories attached to the roof system

Important: The weight of people sleeping in the tent does not count towards the dynamic load rating because the vehicle is stationary when the tent is occupied.

A static roof load ratingis the amount of weight your roof system can support while the vehicle is parked.

This figure includes:

• Rooftop tent

• Occupants

• Bedding

• Camping gear stored inside the tent

Because the vehicle is not moving, the forces acting on the roof are significantly lower. In many cases, static load capacities are three to five times higher than dynamic load capacities.

For example:

This is why a vehicle that can only carry a 75kg rooftop tent while driving can still safely support two adults sleeping inside the tent once parked. Always confirm the payload your specific roof rack system can support while stationary.

Dynamic vs Static Load Ratings: What's the Difference?

For rooftop tents, the dynamic load rating is usually the critical number when determining vehicle compatibility.

The easiest place to start is your vehicle owner's manual.

Look for sections titled:

• Roof load limit

• Roof rack capacity

• Maximum roof load

• Roof carrying capacity

You may also find this information:

• On the manufacturer's website

• Through your dealership

• In roof rack manufacturer documentation

Many manufacturers publish only the dynamic roof load rating because this is the most important safety figure for vehicle operation.

Don't Forget the Roof Rack Rating

A common mistake is focusing only on the vehicle roof rating.

Your setup is limited by the lowest-rated component in the system:

1. Vehicle roof rating

2. Roof rack or platform rating

3. Mounting system rating

The Golden Rule

Always use the lowest rating in the chain.

For example:

Your maximum allowable load is 80kg, not 120kg. The lowest number always wins.

Rooftop Tent Load Calculation Example

Let's say you're installing:

• Rooftop tent: 68kg

• Roof platform: 25kg

• Mounting hardware: 3kg

Total dynamic roof load:

68kg + 25kg + 3kg = 96kg

If your vehicle roof rating is 85kg, this setup exceeds the manufacturer's limit and would be unsafe to use.

Why Exceeding Roof Load Ratings Is Dangerous

Ignoring roof load limits isn't just a warranty issue. It can affect the safety and handling of your vehicle. Potential risks include:

Reduced Vehicle Stability

Extra weight on the roof raises the vehicle's centre of gravity, increasing body roll and reducing stability during cornering and emergency manoeuvres.

Increased Stress on Roof Components

Excessive loads can damage:

• Roof rails

• Roof rack mounts

• Roof rack systems

• Vehicle roof structures

Poor Off-Road Performance

Corrugations and rough tracks create repeated shock loads that can significantly increase stress on your roof rack system. This is one reason many manufacturers recommend reducing loads during extended off-road travel.

Potential Insurance and Warranty Issues

Operating outside manufacturer load specifications may affect warranty claims or insurance assessments following an accident.

How Much Dynamic Load Rating Do You Need for a Rooftop Tent?

As a general guide:

Remember that the tent is only part of the equation. You must also account for:

• Roof rack weight

• Platform weight

• Brackets

• Accessories like awning, recovery equipment, roof cages etc

Choosing the Right Rooftop Tent

At Bushbuck, we recommend confirming your vehicle's roof load rating before selecting a rooftop tent.

Our range of rooftop tents is designed to suit a wide variety of vehicles, from compact SUVs through to touring wagons and utes. Understanding your vehicle's dynamic and static load ratings ensures you can choose a setup that is both safe and compliant.

Browse our collection of rooftop tents here:

👉 https://bushbuck.co.nz/collections/rooftop-tents-camping

Frequently Asked Questions

Can I exceed the dynamic roof load rating when parked?

Yes. Dynamic and static ratings are different measurements. While parked, your roof system can typically support significantly more weight than when driving, provided the vehicle and roof rack are designed for rooftop tent use.

Does the roof rack weight count towards my roof load rating?

Yes. The weight of the rack, platform, tent, mounting hardware and accessories all count towards your dynamic roof load calculation.

Can I use a rooftop tent on any vehicle?

Not always. Every vehicle has different roof load limits and mounting requirements. Always check the vehicle manufacturer specifications before purchasing a rooftop tent.

What happens if I exceed my roof load rating?

Exceeding the manufacturer's rating can negatively affect vehicle handling, increase stress on roof structures and potentially create safety risks while driving.

Final Thoughts

Understanding dynamic and static roof load ratings is one of the most important steps when choosing a rooftop tent.

The good news is that most modern SUVs, utes and touring vehicles can safely support a rooftop tent when paired with the correct roof rack system. The key is knowing your vehicle's limits, accounting for the weight of your entire roof setup, and never exceeding the lowest-rated component in the system.

When in doubt, contact the Bushbuck team and we'll help you determine whether your vehicle is suitable for a rooftop tent setup.