This 12v, Bench-to-Bed seats four comfortably, and turns into a full size bed.

It has car seat restraints and three-point harnesses. An important note is that when the slider door is closed the seat goes the whole width from the door to the wall. It is 65 inches wide. 

While the seat or base has not been pull tested to any DOT standards (because it is cost prohibitive), the seat base and mounting were designed by an engineer with a baby on the way and it was designed to withstand at least 8,000lb pull test. Please note that RV's are not held to DOT standards for seating partially because of their weight and the momentum that creates.