Hello aussiewantsaps2
I cannot assist with how an XC60 tows as I have an XC70.
With regards the tare weight of the car you want to buy ask the dealer for photo of the weight plate on the car or ask him to look on the V5.
That will tell you most of what you need.
On here
https://towcar.info a 2017 XC60 D4 weighs in at 1858kg so if your tin tent choice is 1600kg when full your on to a winner.