split/two piece matress

Looking at jumping into a class C. I really like the floor plan of the couch and dinette on the same side, but would rather keep it short. I also like the triple slide shorter units (Winnie 26A, forester 2501TS, redhawk 26XD). I noticed these shorter rigs with bedroom slides all have a two piece mattress, some fold in half the others slide over themselves.

How comfortable are these mattress'? Can you keep the bed made with the slide in? Thoughts?

Tried searching, but not sure what wording to use and found no results.

Thanks!