dreambound, we're in the same boat. We haven't taken the rv much of anywhere at this point, so it hasn't been an issue.
My only experience with it, is that a very very long time ago, I had a job where I lived on a train. (think about
that and piece it together)
So the concept of your "house" moving is not a new one. But I didn't have kids. I do remember, the people that did have kids, they used those nets, like truckers use, around the kid's beds.
In that situation, there were no seat belts, everyone just moved around freely. The biggest hassle I remember wasn't so much your person moving around, it was securing all your junk so it didn't fall. But. A train isn't moving in traffic, you know, it's a pretty straightforward situation. Having said that, when accidents happen, they aren't pretty, because people and stuff fly.
I am sure my kids will be happily occupied with the GameCube for most of their waking hours, so belting them at the dinette would work. We want to marathon-drive it as much as possible, but we
do have a dog with a small bladder
so we're going to
have to stop regularly unless I can potty-train her somehow. I'll have to make everyone get out and jog in the parking lot.