09/03/2026
The 10% Rule refers to your tow ball weight: the downward force your caravan puts on your vehicle’s tow ball.
As a general guide, it should be around 10% of your caravan’s total weight.
This comes from research and towing standards like SAE International J2807, and it’s widely used to help improve towing stability and reduce the risk of sway.
Get it right, and your setup is far more predictable and controlled. Get it wrong, and you’re increasing the chance of a sway event before you even hit the highway!