no, chances are the factory is limited to the room required for such a large tank, or else they would probably already have one there since the cost for the difference in sizes is minimal... also, 'taking out' a tank is not an easy task, if a modification is considered, since probably the only way would be thru the 'floor' of the basement.
While the Miramar and the Windsport may seem similar, chances are the chassis are not as close as they may look, and the layout of the coach will have a big impact on tank placement and sizes as well.
'14 Palazzo 33.3 bunkhouse 34' diesel
KingTailgater2 Dish HD, 100w/5a SOLAR, BlueOx
100,000+mi since '14 - US, Alaska, Canada.... formerly Georgia, then NorthCarolina, now Alabama : )