This is just one person's opinion based on the experience. We had a B, tried to fit four in it, worked marginally, and those dang kids grew. For us it was just too confined if the weather kept us in it. Plus making the beds for the kids locked us in.
Ended up with a succession of class A's, kept the last one, and now are back in the B biz with a G26.
I'm just saying, plan on them getting bigger and not wanting to cozy with one another.