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Why don't you have a quick google before making stupid comments?
If you're just starting up save the money and go diy.Only you are going to see the back of your van so how 'professional' you think it looks is irrelevant.Is it easy to use and squirt water from your tank to the end of your brush....?Then its a wfp system. Plus that way if anything goes wrong you'll know how to sort as you put it together...