I’m not sure how well the “skoolie” interiors hold up over time, but I am sure you’re right about the long frame flexing. I don’t know what a fully loaded bus would do when it encounters uneven terrain, but I tested mine empty and surprisingly, the suspension did nearly all of the flexing. It seems that the body construction is rigid enough to hold the frame “flat-ish” in those situations.
My focus will be on building a more flexible suspension to protect the frame and body. I also plan to build the interior with steel framed components, isolated with rubber to protect them. Imagine cutting concrete and filling in the gaps with caulking to preserve each individual section.
The link below will take you to a video about Toyota’s KDSS. I plan on building a swaybar system similar to this which will make it corner flat while still allowing flexibility off-road.
https://youtu.be/NLF6n3nMwww
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