Jack and jack stands

Be aware that jack stands are usually rated for the pair. What are advertised as 6 ton jack stands (sold in sets of two) are only rated to safely support three tons each. For storage, where setting up and dismantling stuff is a once or twice a year job, some wood cribbing might be a practical alternative to jack stands (and fully capable of supporting the weight if sized reasonably). I'd avoid having pressure treated wood in direct contact with metal, though, especially aluminum which it corrodes in very short order.

For Harbor Freight stands and jacks, it would not be a bad idea to size well above your actual requirements. Sometimes their ratings are a bit on the optimistic side. I like to think of them as a store to get cheap tools inexpensively, which is a valuable niche when many other places sell cheap tools at not so inexpensive prices.