In order to figure out what you can fit in your new van, you will need to know the wheelbase and roof height of your vehicle. Find the correct guide. The bold line in the diagram is the actual template of the floor. Depending on the vehicle, that does not necessarily mean available space for shelving! There are roof curves, gas fills, and body contours that can interfere with using 100% of the space. Partitions encroach on the available space as well. The guide will show you what is practical to install in your vehicle.