Prepare the van's return in advance
Returning a van without extra charges isn't a matter of luck, but of fifteen minutes' preparation. Almost all the unpleasantness at the end of a rental comes from three things: an empty tank, a delay and undocumented damage. All three can be dealt with in advance.
A full tank is a rule, not a recommendation
You pick up the vehicle with a full tank and return it full. Fill up at the last petrol station before the location, not thirty kilometres before. The vans run on diesel, so be careful which nozzle you reach for at the pump. Keep the receipt; it's the simplest proof.
Return it to the same place
The van is returned to the location where you picked it up. It sounds obvious, but when moving across the whole city it's easy to get mixed up. Check the address in your booking before you set off back.
Allow time for traffic and parking
The last half hour of a rental always takes longer. Plan your arrival with time to spare, allowing for queues and for the few minutes that refuelling takes. Returning after the agreed time is an unnecessary extra item.
If you're running late, get in touch early
An extension agreed in advance is always better than a delay. Deal with it the moment you realise it won't work out, not an hour after the deadline.
Go through the terms the day before
Most misunderstandings arise because the renter only reads the terms once a problem has occurred. Check what condition the van should be returned in, what counts as normal dirt and how damage is reported. Ten minutes' reading the evening before is better than arguing on the spot.
Allow time for cleaning
The van doesn't have to be returned gleaming, but not muddy and full of rubbish either. After transporting soil, building materials or animals, expect cleaning to take more than a few minutes. A swept cargo area and rubbish cleared out of the cab are the minimum expected of you.
Check the van's equipment
Everything that was in the van belongs back in it. The warning triangle, hi-vis vest, jack, wheel wrench and the documents in the glovebox. If you took something out during the rental to make room for the load, put it back before you set off for the location.
Plan your last fill-up around opening hours
Not every petrol station near the location is open around the clock. You can pick up and return the van at any time, but the petrol station may be closed at night. If you're returning late in the evening or early in the morning, check in advance where you'll fill up, so you don't end up driving round half the city for a full tank.