Hi,
You need to look a little more closely at your car VIN data plate and the owners handbook, and really read what is posted there.
Why? Unlike every other manufacturer, Renault quote a maximum towing weight that only includes the driver (or driver and passenger) - so if you need a 4 berth caravan for partner and two small children - that probably will subtract 100kg from the max tow weight.
Most modern caravans have put on weight recently - with "essentials" like microwaves and full sized ovens, loads of chipboard cabinets, etc. Compared to older caravans which didn't include heavy appliances, and used craftsman built framed wood cabinets, you are talking about a serious difference in weight -
If this is your first adventure in caravanning, an older quality caravan will not only be much cheaper and lighter, but won't depreciate the same way new models do.
Alternatively, a folding camper for use in Spring, Summer and Autumn will weight two thirds that of a comparable caravan - and probably give you much more living space
Robert