I agree w/ Graynomad; this whole exercise is being WAAAAY over-thought. You are now discussing an absolute behemoth of a rig that would likely as not be the most cumbersome vehicle in the world to drive, and probably NOT be able to fit through many third-world city streets(and YOU WILL need to...
John, I have a feeling you have a wealth of knowledge to share with "future fabricators"! And may students of yours follow your footsteps into some sort of innovative field of fabrication or vehicle construction!
Again, I wish you well!