Dennis,
Very interested in your progress as I begin on 2nd (and hopefully final) project which is '73 Sovereign center bath.
Just removed the belly pan tonight in the rear and have some rear floor rot (not like my
Overlander thankfully) but also have quite a bit of rust on frame cross members. (In fact, will probably require some fabrication and welding.)
Would like to add gray tank while I'm at it but before I "freelance", it'd be nice to know where Airstream would've put it. I've been told they started in '73 but mine sure doesn't have it (though it looks like it could have).
The dump valve is on the street side below the black tank and has two gray drains (1-1/2") feeding from the front and rear. Seems that while it is all exposed, now would be the time to do it.
So....
Where should I put it?
How big should it be?
Where should I get it (if you know)?
Thanks,