Since I use the X5 as my daily, the E46 can sit for months and have experienced the storage flatspot. I usually can get back to round after a few miles but still an issue. I like the Race Ramps Flatstopper but their 12" Wheel Crib might be better for actually having the tires cradled AND 12" in the air. You are not stressing bushings or joints by storing it on jack stands at full droop and gaining all the ground clearance of the jack stands.
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Camping World has some normal height Chinese hard plastic ones for cheap on a Cyber Monday special and I ordered a set (less than $8 for a set of 2) and will have them sprayed with an anti-skid composite bedliner foam and see if how they work.
https://www.campingworld.com/tire-cr...-2-110707.html
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