We need to know the overall weight of the caravan really before we can give any accurate advice.I've done some digging and realised your car is probably a 1.6 (130bhp) petrol (UK version is also rated a 1400kg). As long as you don't exceed the 1400kg it may be okay, but personally I would be looking to find a car more suited towing. But this is only my opinion. Maybe there are UK members who tow with the 1.6 (130bhp) Sportage?
Even if the 'van only weighed 1000kg?