Under the table. Hard to explain without photos, but...
there is a small ledge by the wall extending between benches that is carpeted (the width of a 12 pack of Coke--maybe 6"-- which we stand on end). I have a small crate in front of that where we store other extra beverages/water and it holds the Coke in place, leaving room for us when we are seated at the dinette. Next to the Coke on the ledge I wedge the extra cushion. Unless we are on a long trip, we usually have extra space in the cabinets over the table and it and beverages go in there.
Very exciting to almost be at the finish line. Hope you love yours as much as we love ours.
Nicki