Shogun Sport is a good car, although not as accomplished off road as the Pajero, but as a tow car it is fine and very roomy. I'd tend to go for the diesel given its meaty torque, and it will be less thirsty, but this can be somewhat relative anyway! Weightwise even the lower kerb weight still gives an 86% match against your planned caravan. As its virtually impossible to weigh the caravan and its contents with such a degree of accuracy the Shogun Sport should be a match for your caravan. After all the caravan makers give a margin of 5% on caravan weight due to manufacturing tolerances and weather conditions (humidity). Sensible loading of car and caravan iaw CC and C&CC guidelines is important and will more than compensate for any slight variations around the 85% guidelines.