A volvo S80 has a towing capcity of 3,300lb (about 1.5 tonnes).
You do not want to tow to the limit of the vehicle it is simply not safe - not so much that the car can't pull it, but more the ability to brake safely.
So, to be safe you want to tow no more than 1.2 tonnes with this vehicle - not sure how much your Ifor weighs but I'll bet its more than 550 kg.
In other words - car may well be legally capable dependant upon trailer weight but no, not necessarily safe.