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Introduced to these in HS auto shop.
I found one about 10 years ago by accident, and found another a few years later. $100 for the first one and $125 for the second.
It's almost as good as having a lift without the potential stress on a questionable concrete floor.
(They even work on a dirt floor with carefully placed 2x6 stock)
They are super sturdy with a heavy positive stop.
I've never seen one that didn't work, even ones that spend their entire lives outside.
They even make models heavy enough to lift busses and dump trucks!
I made cushioned adapters for my 73 bumper slots.