Looking for more space too, I moved a wall or condensed a wall by 6inches in my parents class A. Might not sound like much but with a few shelves, they now have floor to ceiling towel storage and small garbage. And on the other side of the bathroom I cut back the corner wall for the sewer vent so they could get a bigger potty w/heated seat.
They still have some thoughts of moving their sink, there is 4 inches of extra counter space behind the sink and an overhang in front, of several inches, that intrudes on the potty. Sounds good but I think it could be a real pain to re run all the plumbing.
Anything for the Mom
2011 Wildwood T26BHXL
2004 Yukon XL Denali
43yrs of camping; one lucky guy