The towbar is rated at 150kg,but the car is only rated at 80kg. So your nose weight plus you rack plus your bikes can not be more than 80Kg.
I don't want to rain on your parade,but Rd57chad is correct. The nose weight is not just the weight on the towball, its the downward force on the towing bracket and subsequentlycar. It is usually the towball but I have a bike rack like yours and that is included in the nose weight/downward force.Rd57chad said:I'm sorry I think your technical guy needs to get himself retrained . You run the risk of overloading the rear suspension on your vehicle . Your total allowance is 80 kg if you run caravan at 80kg and then add the rack and bikes your asking for trouble