Would something like this work? (Grid of steel beams) https://www.wayfair.com/Lifetime--Galvanized-Steel-Foundation-Kit-60210-L549-K~LXT10088.html https://www.

Would something like this work? (Grid of steel beams) https://www.wayfair.com/Lifetime--Galvanized-Steel-Foundation-Kit-60210-L549-K~LXT10088.html https://www.wayfair.com/Lifetime--Galvanized-Steel-Foundatio...? They use them on TuffSheds, iirc. It's not adjustable. Not sure if it would sink into the soil or not.