Outside Shower Dishwashing Station

I had the very same idea, (it's brilliant!), but then almost immediately realized the gray water implications.  Now I'm pondering a return line from the dishwashing sink to the gray water holding tank.  Since the logical location for an outdoor shower box for our 177, (no factory o/s shower), is on the slide-out wall beneath the kitchen window, both supply lines and the sink drain should be readily accessible.  I haven't gone any further than thinking about it so I do not yet know if everything will flow down hill.

Yes Sir, it is against the law to dispense grey water on the ground at a camp site in a state park in the State of Texas. Just think if everybody did it? All of the camp ground would be one big smelly mud hole. 

Has anyone modified the outdoor shower for washing dishes. We have an 178 with external shower which would provide an excellent place for washing pots and pans and such without making a mess in the trailer.

Since the shower has hot and cold water the only thing I think I'd need is a longer hose and perhaps a nozzle that is more suited to dishwashing than showering.

We carry a table and dish drying rack so this looks like a great mod.

Anyone done anything like this?