Don't be put off - automatic gearboxes can be excellent, effortless towers. Golden rule (as always!) is going to be make sure the car/caravan match is good. Need to be particularly clear that the van weight is well within design spec of the cars capacity. However, all the big 4x4's (inc the Sorrento) are well up to pulling a heavy van, and the gearboxes are set up to deal with this workload without any additional modifications. I tow a big van with a Shogun Auto and can't fault the gearboxes performance. Good luck! Richard