Why tongue weight matters
Tongue weight is the downward force the trailer’s hitch exerts on the tow vehicle. It eats into the vehicle’s payload alongside passengers and any cargo you have in the boot. A trailer that’s within tow capacity can still overload your vehicle if tongue weight + people + luggage exceed payload — that’s the most common rookie towing mistake.
- Conventional trailers: 10–15% tongue weight.
- Fifth-wheel / gooseneck: 15–25% (heavier on the tow vehicle).
- Always check the manufacturer’s plate — not aftermarket tow-bar ratings.