Tow Pro: Towing with new Pajero

Have just bought a new RX Pajero 3.2L diesel with 3,000kg two capacity & 180kg ball load. Have had lots of experience towing horse floats & horses but absolutely none with a caravan. Intend buying a caravan in next few months; how close to the 3,000kg limit can I consider is comfortably towable by this vehicle (ie how close to the 3,000kg gross trailer mass would be safe & not too taxing on the car). Any guidelines gratefully accepted.

Warren, VIC