Hi Adam,
You don't say if you have the Scenic or the new Scenic II, nor the engine power / torque, nor the kerb-weight of your car, nor the maximum tow weight from your handbook. You are going to need that information to find out what you can tow safely.
By safe - I'm going to follow the guidelines from the Caravan Club - which is that your caravan (max permissible weight) shouldn't exceed 85% of the kerb-weight of your car. Nothing carved in stone - just a good guide.
And as you've probably already guessed you going to be looking at the smaller, lighter weight models - no problem there - you'll still achieve good fuel consumption.
You're probably looking at an Eriba Puck, Puck L or Familia; or a Tabbert T@B; or maybe a lighter model from the UK manufacturers. Both the Eriba and the T@B will make people smile - cute, easy to tow, and bags of style.
But find out the weight and power details for your car.
Robert