When i was looking a few months back, for a 650 litre thermopure and renault traffic was 500 plus vat per month over 4 years i think. Ill just check my mails.
This is bang on if you are looking at the van from them as well.
We bought our van second hand, which helped to keep payments per month nearer to what NWH has said.
With the system you get everything to go with it, hose reels, 2x poles, ...... everything you need to get started.
Like NWH says....... its a big time investment, and you need to look long term on the whole thing.
It's a great system though, we like it