You can set a relocation fee for each "Drop-Off" type booking. Drop-Off is where you the owner, transport the van to the hirer's location.
Think about how far you are willing to travel, and how long it will take you to set up the van.
Generally, we recommend that you charge a dollar amount per kilometre that you have to travel. So for a drop-off 50kms away, you might set a Relocation Fee of 100.
But discuss it with the Hirer for each booking.