How do I attach a water tank to a pressure washer? For a mobile car wash?

Hοw dο I attach a water tank tο a pressure washer? Fοr a mobile car wash

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Landa 3500 psi 52 gpm diesel engine pressure washer    US $2,975.00

NEW Dewalt 3800 4Gpm CAT PumpCommercial Pressure Washer    US $739.99