At this point I've looked at all the manufacturers I know of. The Coachmen 292bhs mentioned above is very ideal, and that's the perfect layout for, even without the exterior bathroom entry. But, just when we find something that will work, a quick look at the specs shows it only has a 33 gallon grey tank. That's been more/less the case with most of the units. Our current 5er has 2 tanks that combine for 74 gallons, which gets us through a long weekend without sewer hookups.
We've found some that check our boxes, but at 36' or more, that doesn't work for us. Some of the places we frequent present enough challenges for us having only a 32' camper.
This has been tough!