I guess each of us would have to decide what is "too much". Pretty hard to measure. For me, sway can exceed my comfort level and a passenger is totally comfortable. In times past I have had rigs which I adapted to the sway, and the passenger had white knuckles. I have been RVing since about '72, and I have seen some rigs with way more sway than I would be comfortable with but I have never seen one laying on its side. That would be "too much".
Wayne