I have a coachman amara 520/4 which is coming up to 10 years old.I tow with the Nissan x trail (pre recent face lift) 2.0 litre diesel tekna.I am considering changing to the Lexus RX 400h 3.3 se on a 08 plate.Does anyone have experience of this vehicle and its ability to tow?I do know it can tow 2000k