Ford Falcon: Is a Subaru Forester better?

I LIVE on a property with a long, steep driveway and I need to buy a late-model, second-hand car for towing a caravan. I am tossing up between a Ford Falcon and Subaru Outback. The caravan will be about 1300kg. I am concerned that the extra weight on the back of the car pulling the van up our driveway may cause mechanical problems. I am a Subaru fan and am on my second Liberty. Would the Outback be strong enough in the body to stand the extra forces? Would the 2.5-litre Liberty be powerful enough to tow the 'van in this situation, or should I look at the 3.0-litre version? The other option is that I forget about the Subaru and go for the cheaper, but stronger, Falcon.