sliding patio door rollers

A handy person from DES PLAINES,IL says:
With a fir door does it make sense to use a stainless steel roller over a steel roller on our patio door due to heavier weight. Is stainless stronger or more wear resistant then steel or just more helpful in preventing rust? We live in Illinois not by the ocean.THANKS
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Donna from SWISCO responded:
Yes, I would recommend the 81-149, stainless steel option, it is stronger than the 81-018.
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