As far as I can tell, Monorail Cameras are heavier than the Folding (TOHO is the only exception that I know of).

What is the reasoning behind this? Is it for the simple reason that Monorail cameras were intended primarily for studio use where weight is of negligible consideration? That a Folding does not require the extensive movements for its intended use (Landscape, etc.)?

Could a Monorail be built out of current state-of-the-art materials to make it lighter and retain its traditional sturdiness?

Just curious (it's a slow day at work).