1966 Caravel cedar closet
I replaced the tank and fought the placement problems too. I had a new tank and was able to place the flange outlet where I needed it...and was then able to put the entire tank under the floor where it should have been. It is just plain sloppy Airstream design that put the flanges "close " to where they could be used.
"If it can't be reduced, reused, repaired, rebuilt, refurbished, refinished, resold, recycled or composted
then it should be restricted, redesigned or removed from production."