jack stands

If it's this kind, nothing you put in place of the pin will make them safe, because they weren't really safe to begin with.
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Like this.
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I knew some folks who were close to a story near us where a man was killed.
Jack stands fail, but more often than not accidents are due to human error in positioning the stands properly.
Man killed by car when jack fails – Orange County Register

I never fully trust just the stands due to potential of shifting, so always have a back-up, usually the car wheels go under, or wood blocks if job does not include wheel removal. If not possible because of clearance or lack of availability, I at least include keeping the jack at play with a bit of load on it in a position that is most affective at minimizing the shifting potential of the stands on their own. You will note the story include recommendation of wood blocking in case stands fail to do the job.