You need to distinquish between what is legal and what is advisable.
The 85% figure is the advisable tow limit - a 1800KG kerbweight car is advised to tow a maximum of 1530KG. However, to that 1800KG you should add yourself, any passengers, luggage and also the nose weight. That could quite easily have the car at 2100KG - where upon 85% becomes 1785KG.
So on to the official numbers - since day 1 the new V70 has been rated with a 90KG nose weight and a tow limit of 1320KG (2.0 Bifuel) - through 1600/1800KG (2.5T) to 2000KG (D5 Auto/T6).
Then you get the issue with nose weights - 90KG is reasonably generous - especially if you are running a twin-axle (horsebox, caravan, car transporter).
I regularly run a 1900KG car transporter behind my HEICO mapped Sept 2007 V70 D5 (Phase 3) - and it is superb. I am towing within the cars documented capabilities. The car is comfortable doing so.
The V70 2.0D has a 1600/90 limit/nose manual or diesel.
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