2230kg is the max weight for the car, solo
4430kg is the max train weight, so you can tow up to 2200kg if your licence permits you to drive over 3500kg. But don't forget the 85% rule, it's not law but sound advice
1. 1160kg = max weight on the cars front axle
2. 1130kg = max weight on the cars rear axle
And yes, those axle weights do add to more than 2230kg, you're not expected to balance it 50/50!