It depends on the type of material. If it is polyester then it will be a lot lighter than canvas. The type of poles also make a difference.
However, unless you have a 'baby' caravan with just a sun shade you are certainly looking at 20 kg minimum and as mentioned up to approximately 40 kg. Do remember this if you carry it on the floor of the van.
Some people feel the expense of having 2 types is justifed. A full canvas type for the UK and a simple shade type for Europe.