I think this car is about 1,250kg. Using the 85% guideline you could tow a caravan weighing just over 1,000kg, which to be honest is not much caravan nowadays. The power - 92BHP - is not a lot compared to some of the diesel engines which punch out 130 or 140 BHP. The Berlingo appears to be more of a utility vehicle than a powerful towing car.
If you don't go anywhere hilly and don't mind using the gears a lot, then towing a caravan is possible. I wouldn't like to do it myself. But any of the low to mid weight trailer tents would be just fine.