Treat it as storage, not transport
Check the vehicle and rack limits, pad support, strap routing, hull contact, wind exposure, weather, and theft risk. Use only permitted straps and do not tighten until the hull or rack is distorted. Inspect again before moving the vehicle.
The Bing question has one impression and no click. It is useful because it separates a common storage habit from a travel approval; it does not establish a universal overnight rule.
Limits
No kayak, pad, weather, vehicle, or strap was tested. This guide does not promise hull protection or security.
Sources and related reading
See Also
If you want to move from general advice into actual product choices, start with Kayak Bow and Stern Tie-Downs: When Extra Lines Are Required, Roof Crossbar Static Weight Limit: Find the Controlling Number, and Does Every Tonneau Cover Need Drain Holes?.
For a wider picture after the basics, MaxxHaul 50027 Review: A Budget 2-Bike Rack With Important Limits and Extang Trifecta 2.0 Tonneau Cover Review: Fit, Features, and Trade-Offs are the next places to read.