I have been renting vans for a while as I did the same math's as section swept and couldn't make it add up (a van purchase). I used to pick up a van on
a Saturday morning and drop it off on a Sunday evening, however that company doubled its prices so I went elsewhere and the other hire companies require you to drop the van off on a Monday morning which is a pain for me as I work away during the week and I'm normally away well before the hire shop opens. I've noticed a few people using citreon berlingos at trials (The cars not the van) so I've gone halfers on one of them with my old man as you can use them like a car when you dont need to transport a bike. You can take them to a tip as well (which you cant with a van where I live) . I reckon in a couple of years I'll have spent the same as hiring so I bit the bullet and bought one.
As a BTW a way to decrease the cost of van hire is to buy your own excess insurance costs a lot less than the hire company.