Hi Rockman,
I have a very dated degree in Industrial Engineering, have spent a lot of time studying trailer suspension design and have built a few trailers myself over the years. I am sure that the suspension in these new campers works beautifully.
My point is that springs located well inboard and a suspension with a very low roll centre are not, at least in my opinion, a good combination for stability when everything goes pear shaped on the road.
I am sure that there are plenty of rigs on the road that have not encountered their potential instability problems because the combination of conditions required to induce an uncrecoverable sway have not yet presented themselves. Like loading the thing the wrong way, tyre deflation at speed, crosswinds and road bumps at the same moment, instability in the towing vehicle and and a combination of one or more of these at the same time.
These things don't seem to matter much for very light trailers. But with modern, well equipped campers now getting up over 1500kg or more loaded, we have a whole new ball game with suspension design.
Keith