Backing the Contax 167MT again, I personally do not see how anything could be more ruggedly constructed than this, and I suspect the Leicas are in the same league as I understand they are famed for the quality of their build. I have never read about (or experienced with the 167MT) any particular propensity to damage by vibration. At the end of the day a lot of vibration isn't good for any camera, whatever make. Nor do I believe the Nikon lenses are any better than the Contax Zeiss ones. Equal maybe.
None of the cameras under discussion were built down to a price but you will find you can get a decent 167MT for a lot less than a R4, R5 or F3.
As a final plug for the Contax, it was in production for almost ten years which I think speaks for itself.