1) she wants at least 22" of height underneath.
2) There can be NO obstruction, she wants (NEEDS) to put 6 Rubbermaid
tubs
underneath


Hmmm! My first thought was: Have you considered a walk-in closet or
an office addition. Speculating: Seems she is looking for more space
..... to declutter another area or for organizing her work-at-home
items. "No obstruction" indicates to me the need for quick access to
important items.