I'm with the full size van and travel trailer group. Class A's are getting more and more family friendly but you'll get much more bang for the buck going the other route. Could even take it one step further if your budget will support and go with a conversion van which will make the ride even more comfortable. Stepping back 20 years, no slide, GM powered, minimal delamination and sleeping five comfortably is getting close to unicorn territory.
If you fully intend to stick with a class A don't worry about which chassis it could be built on. Both the Ford and the GM/Allison power trains are extremely reliable and both are simple to maintain. The house built on it is much more likely to rot away before the chassis needs anything major.
