The deceleration forces in a wreck would blow your mind. I did a lkot of work when I was at Boeing on the forces involved in the FAA's 9g deceleration certification requirement.
They increased it to 16g, and I was working VIP airplanes at that time. I've seen what the crash dummies go though when they're on the sidewall divans. I think I'd rather be killed than suffer injuries like that.
As a result, in our motor home, we don't allow passengers to sit on the sofa behind the driver, despite the fact that it has seat belts. We also insist that anyone in the barrel chair behind the co-pilot be facing as much forward as the seat allows.At least that seat's belts are bolted to the floor.
We don't often carry passengers, other than our two Labradors, so peeole crashworthiness is a low priority. We're thinking of adding belts to the dinette, one facing each direction and firmly anchored to structure.
A passenger in the aft-facing dinette seat would be protected by the seat back. I figure the one facing forward would stand a better chance there than sideways on the sofa.
Frankly, I'm disgusted by the lap-belt-only set-up for the captain and first officer. They're tied to the seat base, for goodness sake! I have no confidence that Flexsteel's fore/aft adjustment mechanism would be strong enough in a crash. The occupants would go out the front, still firmly attached to their seats.
I'd love to replace that J. Michael Mouse set-up with a proper 3-point inertia reel system anchored to vehicle structure instead of the seats, but have no info on the underlying structure of the MoHo aft of the front seats. As far as I know, Mercedes has the only front seats certified for the US with a full harness built into the seat. I think they're on the S-class and I don't know if they'd be adaptable to a MH installation, and I'm dead sure I couldn't afford them!
Frank and Eileen
No longer RVers or FR owners