We took the water tank out of our 13'
Trillium. Our reasoning was - we cook, eat and wash dishes outside, carrying water from home or a campground tap. Our stove and sink are covered by a shelf that we find more useful. To do this the taps were removed as well. We also removed the back of the front couch (that lifts up to make an upper bunk.) We have stored all these items in case, when we sell, the new owner wants them.
The bed is in the 'ready to use' position just about permanently, with some memory foam inside a sheet over it (confort matters!). We haven't found it a problem to flip aside the memory foam, remove the cushion and 'hatch' and collect items from inside, The space holds spare food for emergencies (and for when we are heading out on a longer trip - or taking hungry grandboys along). The same under bed space on the other side holds the windwalls and bugscreens for the canopy.
So many options with these little eggs - seems like there is a good option for most challenges. I find it fascinating to read the ways we all make our campers comfortable for our 'style'.