You might call Dolphin and ask which models are better suited for vinyl. Also, there are special foam rollers that can be put in place of the bristle style rollers which supposedly cleans the smoother vinyl surface better.
It's the tracks that do the damage. Apparently when there are sharp/pointed things already pressing the liner from behind, or possibly the corners of vinyl covered steps or ledges. The latter of these I'm thinking would be pretty unusual though.
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