I'm investigating changing to a 5th wheel RV - that's the kind of travel trailer that you tow behind a pickup. In such a setup, there is no access from the driver in the truck to the living space being pulled behind.
My wife is under the impression that in such a setup, the kids are not allowed to be in the RV while the setup is in motion. I am aware of no such rule. When I asked an RV salesman, he said as long as there is an uninterruptible communications mechanism (e.g. walkie talkies - but not a cell phone), it's legal. That said, he was trying to sell me a 5th wheel, so NaCL added.
Here's the question then - Generally speaking, is it permissible for people to occupy the 5th wheel, while the thing is in motion? And, is the answer different if my wife is in back with the kids? In other words, is it okay for my wife to ride with me, and have the kids be alone (they are actually rather responsible for 10 and 7), or would that be negligence?