YankeeDoodle, Shari, thanks much for the etiquette lesson. I figured this was the case and as you can see above, I'm definitely scoping out what to look for in the base AS for my needs and what supplemental gear might be needed for boon docking responsibly (I guess it's called boondocking, not bushwhacking, tks for the terminology). In fact, the whole reason I'm going with the mid to late 70s Sovereign
or Excella is the addition of the gray tank in 73-74, and then the improved frame and a center bath with tanks over the wheels for better structural soundness.
All the above is great advice and I'm sure I can come up with a good gear solution that will keep me environmentally friendly, well supplied, and, most importantly, keep the outhouses clean for Shari.