I'm not 100% certain of the weights of your caravan but as far as I have been able to ascertain, its MIRO is around 1000kg and the MTPLM is around 1160kg. If these figures are correct, you will not be able to tow it legally with a Zafira 2.0 DTI unless it is well nigh empty. The maximum permissible towload of that particular Zafira is 1050kg. Add to that the noseweight of 75kg and your caravan must not weigh more than 1125kg in total in order to remain legal. If you want a Zafira, you'd be better off with a larger petrol engined version or wait until the new Zafira is on the market with the 1.9CDTI engine.