Unfortunately the new Honda HR-V 1.6iDTEC can only tow 1,400kg, which is unfortunate because mine is good to drive and is doing 60mpg. But Toyota is stating that its new RAV-4 2.5 petrol hybrid can tug 1,650kg and that might be the (relatively expensive) answer. Sadly, the Sorento will fetch buttons so it might make more sense to keep it until it drops and buy a small, cheap diesel such as a Dacia Sandero 1.5DCI for your commute, then p/x that for a reasonably economical caravan tower when the Sorento eventually dies.