The towing capacity is the maximum weight a car can tow legally. However, it may not be safe or comfortable to do so. The towing capacity may be published within the handbook of the vehicle.
For safe towing it is recommended that the fully laden weight does not exceed 85% of the kerbweight of the towing car. If the maximum mass of the caravan is 85% or less than the total kerbweight of the car, the car will tow the caravan easily. If the maximum mass is between 85%-100% of the car's kerbweight, this could be potentially more difficult to tow and should really only be done by experienced caravanners.