The K1322TS makes a great mobile unit. Paired with a Cox Hose Reel, it's a great setup to keep tucked away in the van or trailer. The main thing you'll need, though, is a beefy generator. Kranzle recommends a minimum of 4800W. The K1322TS also has a self-priming pump, making it a good choice for a water tank.
Here's how we would set it up:
Water tank >
Inlet and Garden Hose Upgrade Kit
Kranzle K1322TS Pressure Washer
Mosmatic T304 Stainless M22 Female 14mm to 3/8" Quick Disconnect Plug
Mosmatic T304 Stainless 3/8" Female QD Coupler x2
OG Spec Mosmatic Swiveling Sprayer
18" x 8" Pressure Washer Shelf or skip the shelf and just keep it mounted to the floor.
I'd skip the Piping Package and CR Spotless. You'll want to get an industrial DI filter tank and fill your water tank with that before you head out for the day. Then you'll always have good filtered water in the tank with no need to filter on the fly.