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I use a floor jack and two sets (low and high) of jackstands. What used to take 4 lifts I can now do in two, up to about 18".
In this browser, at this location, the link '14 inch high plywood boxes' just goes to page six of another thread. In this I assume it was to describe a cubical box.
Instead of a box—use two truncated triangles with interlocking slots to make a pyramid. If they are going under the tires, the one going across the tread can be flat and the one with the tread can be curved upward.
Are you going to use new or recycled materials?
A new material I'm going to test is FiberFix tape. It's billed as '100 times as strong as duct tape' but it's inherently double-sided. If it works the way I think it will you'd have to remove anything you tape to the undercarriage with a hammer and chisel.
I've got some to test, if I get off my b*tt I'll post some result here.
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