Hi. I have a 1998 Laguna estate and tow a twenty foot twin axle caravan weighing 1360kgs max behind it. what I did to varify my weight was to load the van and car as if we were going away for a break, including out two hefty Labradors. Then I drove to our local farmers grain merchant gave him a fiver and got the whole outfit weighed. We done the gross train (car, caravan and occupants) the max weight of the caravan on it's own and the weight of the car on it's own, all for the price of a pie & a pint.
By the way the outfit tows fine despite being within 50kgs of top train weight. Renaults may be a little stingey on the tow eight but they certainly have the power, torque and gear box ratio's sorted.
I've towed for over twenty years with ten different cars in the renault range and found them to stand up to the stick of towing very well and also they give good fuel economy, currently 32mpg from my 2 Ltr estate.