VAN/Kombi used up to max. 20,000 Euro

Hello together, we have studied the forum sufficiently and are now in the final decision-making phase. We have a maximum of 20,000 euros available for a used vehicle. The car is moved about 12,000 km a year. The most important point is a large trunk as much as possible. We have 2 children and drive away very often for a short weekend. So we need proper space for our things. Currently we drive a KIA Ceed Kombi. Which from the size is no longer sufficient. approx. 20% me hr would be good, so at least around the 650l boot volume. Currently in the selection: VW Touran used Opel Zafira used Renault Grand Scenic used Dacia Lodgy new If anyone else has an idea, gladly answer. We also take a Euro 6 diesel, if we want to pull a trailer/cart. Greetings and thanks