Hello Noel
I note that you have chosen a large people carrier, and a large caravan. I therefore guess that you have to accommodate a larger than average number of holiday makers - and that is where you may have a problem:
Renault in their wisdom have had a tendency to specify quite large maximum trailer weights (MPTLM), and whilst the cars are capable of handling such trailers, you can't have a fully loaded car and trailer at the same time. If you add the weight of the loaded car and the loaded caravan together, it must be no more than the car's stated Gross Train Weight (GTW) allowance.
I understand that later models have had revised GTW's but you must check your vehicles specification, as changes to specifications are not retrospective, unless a letter of conformance and a new plate is fitted by the vehicle manufacture.
I do not have the exact specification for your car, but what my sources tell me is is that:
The 1.9 Dci Espace has a kerbweight of 1755Kg and a maximum permitted towed mass of 2000Kg.
The Swift Charisma 650 has an MPTLM of 1710Kg, That gives a towing ratio of 95%.
On the face of it thats OK but I have 2000 Grande Espace 2.2Dt with similar specks but I have a GTW of only 3700Kg, That means I could tow your caravan , but I would be left with only about 250Kg for passengers and any other luggage or bits and pieces in the car. - which is not very much for six or seven people.
It is essential that you get the details about YOUR car, either from the hand book, or data plates on the vehicle, Failing that your Renault Dealer should be able to find out for you.
PS. My Grande Espace is a great tow car, it does handle a fully laden twin axle trailer that I use (2000Kg). The 1.9 engine actually produces more power than mine, so it lead to an even more capable vehicle.