I have a 2005 petrol 2.4-litre Volvo XC90 with 60,000 on the clock. My dear wife recently put a tow bar on it to pull the recently-acquired two horses and trailer. When both are loaded I am concerned it doesn't have the power to tow comfortably. We need a minimum 6-seater as she decided that four children were necessary to make our life complete. All are now big enough to argue that the rear seats do not have enough legroom for them, as they have inexplicably grown taller after eating me out of house and home. Could you advise something that would satisfy both horses and children?