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Demand Is Booming for New No Tech, Repairable Tractor
(www.404media.co)
Whether it be electronics, automobiles or medical equipment, the manufacturers should not be able to horde “oem” parts, render your stuff useless if you repair it with aftermarket parts, or hide schematics of their products.

Summary video by Marques Brownlee
Great channel covering and advocating right to repair, Lewis Rossman
honstly it seems like it's a pretty fucking low bar to make a low-tech vehicle. The designs and plans have been around for a REALLY long time.
It's mostly issues with legislation and efficiency and billionaire companies trying to stop it.
Check out https://www.opensourceecology.org/
All sorts of important agricultural and industrial tools open sourced for rural/impoverished areas.