I use a Suzuki Vitara 5door. I took the back seats out and put an upright 250l tank in, leaves plenty of room for everything else. Previously, I used it with the back seats folded down and had to unload and reload daily, but there was room for 6x25 litre bottles and all the gear.
I guess it is not as economical as a 1.6 van but most people use bigger engines. Most of my round is town work, making parking difficult, the Vitara is quite a short vehicle. I also use it to move my caravan from a storage field, on a hill.