Well, my Mk 1 has put up with the rock-hard suspension of my Mini across all sorts of rough roads since '99, still with the original disk(s). No skipping at all, even though that was my original worry. There was one problem with one disk which seemed to be a skip on hard bumps, but I finally traced this to a poor cable crimp.
Disks are cheap these days, and the sled mounting for the drives is good so long as the rubber mounts are properly in place. For confidence, run a drop of superglue under the lips of each one in the sled.
No problems - go for it!!
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One of the few remaining Mk1 owners...
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