Terracan towing capacity

I was wondering if anyone can confirm what a dealer told me today about the maximum towball weight permitted on a Terracan. Although they are rated to tow 2500kg he told me they can only have 120kg download on the towball, not much use I say. This is not mentioned anywhere on the brochure etc. so I was hoping someone with a Terracan can confirm this for me.
If this is true, and given that the rule of thumb is that a caravan or camper should have 10% of its total weight on the towball of the vehicle, the Terracan is really only good for about 1200kg.
I look forward to someone setting me straight.
Stu