Hi Matthew, i purchased a new Carens 2.0 CRDi SR 7 seater in December. Great car. Haven't towed with it yet, but i have purchased 2 progressive rated M.A.D rear coil springs, as it does sit low, and goes even lower when loaded, even without the caravan.
I have a Swift Conqueror 520 lux @ 1300kg loaded, Max tow is 1500kg, so i dont see a problem towing at all. I'm hoping to purchase a new van @ NEC at the weekend. Either a Bailey Pagent Provence @ 1450kg or the new Xplore 596 T/A @ 1530kg, but feel it would to both OK. It has a good heavy Kerb wieght of 1680kg. The only 2 things i would point out are, A, the foot operated parking brake, great once you get use to it & B, the light grey seat covering on the GS & SR models marks really easy, especially water marks from the rain. But i feel it is much better than my previous 2 cars, a 2003 Kia Sedona CRDI & a 2002 Rover 75 CDTi Tourer.
Go on, take the plunge, you wont regret it, especially with a 5 year bumper to bumper warranty.