I had a 400h for 5 years and towed a Bailey Senator twin axle at 1700kg with no problems, except for the 18 to the gallon. I now have a 450h which is a little lest thirsty, 22 mpg towing and I've even averaged 38 mpg on a long run from home to Dover. Your caravan is about the same weight at MRO 1534kg and MTPLM of 1740kg, within the 2000kg max towing capacity.