Rule
The roof has its own limit
A vehicle has a maximum permitted roof load, separate from and much lower than its maxlast. It is set by the manufacturer and includes the weight of the rack or box itself, not only what you put inside.
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What weight on the roof does to the car
A vehicle has a maximum permitted roof load, separate from and much lower than its maxlast. It is set by the manufacturer and includes the weight of the rack or box itself, not only what you put inside.