Thanks for all of the quick replies - excellent feedback!
Size...I'm really hoping it won't be too limiting for us, at least at first. She'll be 80-100lbs fully grown, which won't be for a couple of years.
As to the chaos of us 5+dog full time in the camper (2014 Greyhawk, class C, 31ft), yeah that is the one big thing that makes us afraid to fully commit just yet. It will be a year of a whole lot of togetherness and zero babysitters or sending them off to school. And homeschooling. And, and, and...there is a huge amount of planning and pondering going on in our house! Finances will be unchanged, greatly improved actually, without the mortgage/etc. Hub and I are both airline crew. He'll still be working a light schedule, I'll work next to nothing, so we'll just plan to be nearish a commercial airport if one of us needs to go to work for a couple of days. If we get out there and it just isn't working for us, we'll just quit. We are selling our home with plans to make a major move at the end of our year on the road, so we can just fast forward that if need be. But odds are we'll make it work. We are travelers by trade and hobby, and our kids are well adapted to it! The difference now is that it will be road rather than air, and if course no 'home' to come back to at the end of each trip.
So we still have a lot to learn, but I'm hopeful it will work out! But we do have an easy out if need be for any reason. :-)