That is very expensive for an x reg van, even with that mileage.
Also, unless there are 2 of you, 1000l is far bigger than you need. For a 1 man setup, 500l is more than enough.
The other point i would make is finding out exactly which version it is. You say it is a 2.8, is that because it says 2800 on it?, if so, that is not the engine, it is the gvw, and it will be well overweight with a 1000l system!.
If you really need a 1000l system, you could diy one for well under £1k, and you could get a decent renault master half that age for £8k tops. Are the poles worth £10k?