Newmar/Tiffin vs. Coachmen Miranda Select/Fleetwood Bounder

If I remember correctly Winnebago has used drop rail frame for some time now. Tiffins used raised rail which gives some storage above the bottom of the rails, not as easy to access as drop rail storage, but more of it:)

"Seems like Winnebago would adjust their chassis structure to catch up with storage space." would be a major re-engineering starting with a different chassis design. They needed the drop rail for their basement AC among other things.