[Modified3019]

If you are looking for future ideas:

While most vehicles used in ag are going to be combustion based for a long while, if you could apply the shock mitigation to a just a chair in spray rig (https://hayandforage.com/images/29-Thome_MR_38-WEB.7650.png) or fertilizer buggy, a lot of spines could be saved.

These vehicles are lighter and generally run faster than tractors, and applicators who run them for decades tend to be forced to retire in pretty bad shape.

[ahartmetz]

What a waste of people's health and workforce. Do they not have pneumatically sprung seats, at least, if the vehicle has no suspension? These have been available for a long time - my dad was a farmer and had one on his mid 80s Fendt tractor.

[Modified3019]

Yes, those exist and are very much used (and replaced as a maintenance item).

Unfortunately does not eliminate the slow accumulative injury of going over rough and tilted ground for decades.

It seems like more of an issue here in the willamette valley of Oregon than it was in southwest kansas. I think the steep hills limit what is reasonable for suspension to counter with spines held at an off angle for long periods.