If its the escort van 1000ltr system, I would personally steer clear of it.
If you are looking to get into wfp systems I would suggest a trolley system from one of the many suppliers, omnipole, cleantech, aquatech, etc.
It may cost you a bit more, but at least you have the back up when you are just starting out, and believe me you will need to be able to ring someone at the drop of a hat and say "Mike, this system I bought last month, I can't get this to work, or how do I do this". Would you get that off your ebay seller???