To build on itsnotanova's idea of using pavers, would the owner mind if you excavated the gravel in one section, brought in some sand, level & tamped it, and placed the pavers over the sand....keeping it relatively flush with the gravel around it.
This makes for a pretty robust, non-permanent parking/work area. And I would still use some 3/4" - 1" plywood squares under the jack stands and floor jack to spread the load a bit.
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