I looked at the nemo, they are a very nice van, compact and not expensive. Inside is comfortable too with some clever seat folding thing.
Unfortunately payload is just nowhere near big enough, shame! I also suspect the actual load area is a bit too small.
I got a VW Caddy instead, double side doors and nice big payload for my 400 litre system. superb van the caddy is, highly recommend.
My advice would be, there's no use getting a van that doesn't have enough payload or space for a decent size system. You'll be kicking yourself later!