IIRC, can't really mix alu and stainless, it would result in some galvanic corrosion eating away at it. In theory, when installing alu skids, we should add insulator pads on the bolts/contact points to the steel frame. But in practicality, it's probably entirely negligible.
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Some of the vibration reducing ones might be nice to try, though I doubt it'd be noticeable.