[B_and_D]

It seems that the only way this could happen would be if there was one person in the bed, putting their full weight on the very front (or rear) outside edge of the bed. I usually don't latch up the back bed (because I'm afraid that we'll forget to unlatch it when we collapse the bathroom walls and tear it out) and we've never had this happen to us, even if there's only one person lying in the very back towards the window.

Have you really had this happen? Why hasn't it happened to any of us? The support arms, plus the weight of the bed towards the center of the trailer seem to be enough to support the whole bed even if the latches aren't in place.