Quote:
Originally Posted by Ninja Bob
I've never heard of the 15% rule. But my tongue weight limit, per Toyota, is 640. Which the rack and bike together come under.
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It comes from large data-base from millions of users collected over time. Compiled and analysed by people who tow for a living and those who makes towing equipment for a living. Insurance companies and police dept. etc.
https://www.curtmfg.com/towing-capacity
https://www.etrailer.com/faq-trailertowtips.aspx
https://www.gmc.com/gmc-life/trucks/...or-safe-towing
But it also varies by type of towing load. If you've got big trailer with multiple axles and its own brakes, then it can carry most of its own load and you'll end up with less than the 10-15% amount often quoted for tongue-weight.