Write the load equation before loading
Record the vehicle’s driving roof limit, rail or fixed-point limit, crossbar limit, feet, accessory, and cargo weights from their exact manuals. Add the rack and accessory weights to the cargo, then apply the lowest rating. Keep static or parked limits in a separate column.
The Bing and Google rows show a recurring terminology question, but they do not establish a universal number. A rating is only useful when the system identity and use condition match.
Limits
No vehicle, rack, accessory, speed, road, or load was tested. This guide does not provide a model-specific capacity or permit ignoring a manual.
Sources and related reading
See Also
If you want to move from general advice into actual product choices, start with Can a Kayak Stay on Crossbar Pads Overnight?, Loose Roof Rack Noise: A Torque, Bar, and Fairing Diagnostic, and How to Keep Hitch Cargo Carrier Straps from Fraying.
For a wider picture after the basics, Roof Rack Crossbars with T-Slots vs Round Crossbars: Which Style Is Right for Your Vehicle and Extang Trifecta 2.0 Tonneau Cover Review: Fit, Features, and Trade-Offs are the next places to read.