As an owner of a PW Excel, I have no specific experience with any of the models you describe. However, I would like to offer a few comments.
Although traveling in a Class B with children may be feasible at a given time, it might become rapidly crowded knowing how fast kids can grow. With the cost of Bs these days, specially new ones, you may be faced with an expensive upgrade in a short time.
You also mention using the B as a second vehicle. I notice you live in the North-East where snow and salt on the road may be frequent. It might have been OK with the Traverse that has few items under the belly but the more elaborate units you examined have far more equipment under the belly that could deteriorate quickly. They may also be more challenging to drive on winter roads.
Have you considered a small trailer pulled by a car or pick-up? That might fit most of your criteria although I admit that is much less convenient as a B for driving and parking.
I also agree that most Bs are made for 2 people, and if they travel with kids, these are likely of the "furry" kind.
Good luck in your quest.
Alain
