The trouble with nearly all Renaults is their relatively low maximum permissible gross train weight. In the case of the Laguna, if you've got the car fully laden, you'd be left with only 1105kg to 1125kg max. towload, depending on the model (saloon/estate; manual/auto).
However, if you don't put much luggage in the car, it would be a reasonable tug. The weight ratio would not be more than 89% (the most unfavourable combination being the manual saloon) and the ultimate permissible towload is always 1500kg, regardless of model variant.
If you want to pull a 1300kg caravan, you would be left with a payload of around 430kg for the car (again, this varies a bit on the model variant). The 430kg would be everything in addition to a 75kg allowance for the driver (these 75kg are included in the kerbweight).
In short, if you put a lot into the car when towing, the Laguna would not be suitable. If you drive with the car nearly empty, it would be OK.