I don't know exactly what your planning is, but in general I think with five on board the extra 5 ft can make a difference. I would also note that a family of five can put a lot wear n tear on a coach. To forestall rapid deterioration you buy as high a quality as you can. Quality lasts.
John & Diane, fulltiming since '12
'02 DS, FL, Cat, '04 Element
John & Diane, Fulltimers. RVM103 NHSO
On the road since June '12 with Lincoln, the guard cat.
2002 Dutch Star 40, Freightliner, Cat 3126, 2004 Element