Understanding Rooftop Tent Weight Limits
Rooftop tent compatibility isn’t determined by a single weight figure. Your vehicle, roof-bar system and rooftop tent can each have their own limits and requirements, and all of them need to be considered.
Dynamic roof load
The dynamic roof-load limit is the maximum permitted roof load while the vehicle is moving. Check your vehicle handbook or manufacturer information for the limit applicable to your exact model and roof configuration.
Remember that the roof load isn’t just the rooftop tent. Depending on how the manufacturer specifies its limit, the complete roof-mounted system may include the roof bars, mounting equipment, tent and anything carried within it.
UK Government guidance states that loads carried on car roof racks must not exceed the manufacturer’s recommended maximum weight limit.
Static loads
When the vehicle is parked and the rooftop tent is occupied, the roof system is subjected to a much greater static load from the tent, occupants and their equipment.
However, don’t assume that a vehicle’s stationary capacity is simply three, four or five times its dynamic roof-load limit. Whether a rooftop tent is suitable depends on the vehicle, roof structure, mounting system, roof bars and tent manufacturer’s requirements.
If a reliable static figure isn’t published for your vehicle, don’t invent one or rely on a generic multiplier.
The lowest applicable limit matters
A rooftop-tent setup is a complete system. Vehicle limits, roof-bar capacity and rooftop-tent requirements must all be respected.
A roof rack having sufficient load capacity doesn’t necessarily make it suitable for rooftop-tent use on a particular vehicle. Always check the exact combination and any restrictions specified by the manufacturers.
UK Government guidance on carrying loads on roof racks
Thule rooftop tent and roof rack guidance
Is My Vehicle Suitable for a Rooftop Tent?
Vehicle size alone doesn’t determine rooftop-tent compatibility. Some larger vehicles may have manufacturer restrictions, while some smaller vehicles may have approved rooftop-tent setups.
Check:
- your exact vehicle, model year and body style;
- its roof type;
- the vehicle manufacturer’s roof-load guidance;
- the exact roof bars, feet and fitting kit;
- whether that rack system is suitable for rooftop-tent use;
- the rooftop tent manufacturer’s requirements.
If any part of the combination cannot be verified, get further advice before fitting the tent.
Rooftop Tent Weight
Rooftop tent weights vary considerably between models. Always use the manufacturer’s current published weight for the exact tent you’re fitting rather than relying on a generic figure.
Remember that tent weight is only one part of the compatibility check. A lighter tent does not automatically make an otherwise unsuitable vehicle or roof-rack system suitable.
Choosing Roof Bars for a Rooftop Tent
Roof-bar load capacity is important, but capacity alone does not establish rooftop-tent compatibility.
The roof bars must:
- be correctly specified for your exact vehicle and roof type;
- have sufficient capacity for the rooftop tent while travelling;
- be installed using the correct feet, fitting kit and mounting positions;
- meet the rooftop-tent manufacturer’s requirements for bar dimensions and spacing; and
- not be subject to a manufacturer restriction on rooftop-tent use.
For example, Thule’s Evo Clamp feet have a maximum load of 75kg and are designed for vehicles without pre-existing roof-rack attachment points. However, Thule specifically says its rooftop tents should not be used with roof-rack systems consisting of Clamp feet because the high static loads created when occupants are inside could damage the rack and/or vehicle.
Roof Type and Mounting System
How the roof bars attach to the vehicle matters as well as how much weight the bars can carry.
Raised rails, flush rails, fixed mounting points and plain roofs can require very different rack systems. Don’t assume that one mounting type is universally suitable or unsuitable for rooftop tents, check the requirements for the exact vehicle and rack.
Pay particular attention to manufacturer exclusions. For example, Thule excludes its Clamp-foot systems from rooftop-tent use even though those systems are designed and approved for carrying other roof-mounted equipment.
Driving with a Rooftop Tent
Adding a rooftop tent increases the weight and height of your vehicle and can affect its handling, particularly when cornering, braking or driving in strong crosswinds.
Drive to the conditions, allow additional space, avoid sudden steering or braking inputs and remember your vehicle’s increased overall height when approaching car parks, barriers and other height restrictions.
Follow any maximum-speed guidance provided by the rooftop tent, roof-bar and vehicle manufacturers.
Check the tent and roof-rack fixings regularly in accordance with their installation instructions, particularly after initial installation and during longer journeys.
Weather and Additional Weight
Snow, ice, standing water and wet equipment can add additional weight to a rooftop-tent setup. Clear accumulated snow, ice and standing water before travelling and follow the tent manufacturer’s guidance for use in severe weather.
Don’t forget to include any equipment or belongings carried inside the tent when considering the travelling load.
Renting a Rooftop Tent
Before renting a rooftop tent, make sure the complete setup is suitable for your vehicle rather than relying on the tent’s weight alone.
Check your exact vehicle, model year and roof type, the vehicle manufacturer’s roof-load guidance, the roof-bar system being used and the rooftop tent manufacturer’s installation requirements.
If you’re renting through RentMyRoofbox: provide accurate vehicle and roof details when booking. Where compatibility can’t be confidently established, the setup should be checked before the booking is confirmed.
Insurance: Check with your insurer whether fitting or using a rooftop tent needs to be declared and what cover applies to the tent itself. Requirements vary between insurers and policies.rooftop tent needs to be declared and what cover applies to the tent itself. Requirements vary between insurers and policies.
Warranty and Insurance
Vehicle Manufacturer Warranty
Fitting a rooftop tent may have implications for your vehicle warranty or insurance depending on the vehicle, equipment and policy.
Follow the vehicle and equipment manufacturers’ installation and load requirements, and check with your vehicle manufacturer or dealer if you’re unsure whether fitting a rooftop tent could affect warranty coverage.
Insurance requirements vary between providers and policies. Check with your insurer before travelling to find out whether a rooftop tent needs to be declared and whether the tent itself is covered against loss, theft or damage.
See our Rooftop Tent Insurance UK guide for more information.
Rooftop Tent Compatibility Checklist
Before fitting a rooftop tent:
- Identify your exact vehicle, model year, body style and roof type
- Check the vehicle manufacturer’s current roof-load guidance
- Confirm the exact roof-bar system is correct for your vehicle
- Confirm the rack system is suitable for rooftop-tent use
- Check the tent’s weight and installation requirements
- Check required crossbar dimensions, spacing and mounting positions
- Follow the lowest applicable load limit across the complete system
- Follow all vehicle, rack and tent manufacturer installation instructions
- Check your insurer’s requirements before travelling
If compatibility can’t be verified, don’t assume that because the bars physically fit or the numbers appear to work, the rooftop tent is suitable.
See our complete rooftop tents guide for more information.
For more rooftop tent ownership guidance, see our articles on winter camping protection, insurance coverage and security measures.
