Okay, everybody, I like the tank idea, too.  I think it is very cool and I'm
tempted to consider one.  But for 10 years I have simply put a 2-gallon
bucket under the sink drain outlet, and emptied it into the appropriate
place: be it the dish-washing sink provided by the campground, the RV sewage
dump, or whatever.  There is no need to dump greywater on the ground at a
campsite(and, frankly, no excuse!).  I have always had two buckets in my
van: one labeled CLEAN and one labeled DIRTY.  Dirty is useful for many
things, I'l let you figure the rest out.

Melissa Mourkas
Haydenville, MA
81 Westy 'Hildie'