We had a 40' no slide Dynasty that we thought would fit our needs. About 6 months before my retirement we looked at a 4 slide coach and decided we needed one. The extra room was impressive. Further research showed our current coach would fit our needs much better. A 45' four slide coach with a tag. More room, more CCC and more comfort.
IMO, take your wife to several RV dealers/shows and check out different size coaches. When she enters the right one, like mine did, you'll know immediately it's the right one....Dennis