Whoever said you can't support the camper by the frame?

I had a camper trailer with a false frame. The false frame was a perimeter of flimsy steel "framing" that was intended just to attach the walls to, it was not part of the chassis, though it was welded to and appeared as the frame. In that case you would not want to jack or support the trailer under these "frame" members. That is the only thing I would think a person could possibly mean by incorrectly stating to not support a frame, and he would not know the frame from the wall support either