The Solid Caravan Company is planning to sell some avant garde caravans of different mathematical shapes but need to put each design's capacity in the brochure in cubic metres. Can you help calculate the volume in each case? Cube, cuboid, cylinder, triangular prism, square-based pyramid and cone shapes used. (The maximum width has to be 2.9m to avoid requiring a police escort for being a "wide load" by the way).