Storage space – who offers the most?

Hello, the following problem: My “old ones” remember to exchange their previously used Mercedes E-Kombi. This is the model series 210 which was characterized by everything I know by its quite enormous volume of storage space, also in comparison to the successor is that right? Well, in the future they actually need more space, especially in length and width, but also in height it is of advantage. However, especially my father has a certain amount of advantage. n the demand for compfort&power, vehicles like a VW bus, Ford transit etc. that would really offer the space they need, so everything falls out. That’s why I thought of an off-road vehicle, but also there are not the really big hard devices in question that really offer space like a suburban etc. The direction would be rather like a VW Touareg, Volvo XC90 etc. The things have but as far as I know far less interior space than one can avoid due to their external dimensions So my question is: Is there a possibility to compare the liters of second-hand cars somewhere? Ideally the volume of the E 210 in comparison? The price range goes up to 20,000€, the vehicle may not be older than 7 years and should have under 175,000 on the clock. I myself had thought most of all about the Land Cruiser 100, because an GL is still too expensive at the moment, but does it really offer more than one Touareg? Greetings