I need to rent a medium sized van, as I have to carry 12 sets of training equipment along to a customer's site. Each set requires a space of about 0,3 m3, so alltogether abot 4 m3 transport space must be provided.

But all I can find are all kind of sedans, mini vans, station wagons, or mini busses. How must I proceed to get my van in the required size?

I am located at the city of Regensburg / Bavaria.