Okay, here is some info and an explanation for you.
Caravan tow ball weight is usually 10% of the ATM
If it's too light, there's not enough downward pressure to ensure safe towing. The combination will 'snake' under tow, especially down hills.
If it's too heavy the tow vehicle's rear suspension will be forced down, affecting the vehicle's braking and steering.
In Australia, if the towball weight exceeds 125kg, it is recommended that you fit a hitch receiver to allow the use of a heavy duty weight distributing hitch.
A two bar mini system is good for up to 82kg tow ball weight, a heavier four bar as in an earlier post, 120kg and the larger twin lug system with chains, come in 250kg, 340kg and 455kg capacity ball load weights.





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