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I'm hearing that the newer systems are more prone to this problem because the ram is visible and exposed to stuff such as rain splashing of anything from concrete pad dust (corrosive) to fine sand (abrasive).
The older rams were encased within a square inner tube and perhaps less susceptable to outside contaminants.
A redesign of the system around late 05 resulted in mounting tabs merely being welded to the outside of the cylinder itself which negated the need for a separate mounting encasement. Perhaps a weight savings and far easier to service (replace) but not necessarily a good thing for longevity of the inner ram?
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Sandra, Bruce
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