Steel welded frames

In my gypsy wagon I used 20mmx20mm steel tube for the frame and the thing came out stronger than I had thought. The towing width and the height are what governs a tiny house. What about a house on skids like when there was no wheels?
The two photos below show an early house on skids photographed up near the Queensland border.

The cladding is plywood with a steel roof.
Now if one were to build a sixteen foot high house and lay it on its side for transport then the height restrictions become higher.
Maybe a three story tiny house!
This is my gypsy wagon...