Has anyone tried these?

Race ramps are $179 for two 6" pieces so you'd have to buy 4 sets or 179 X 4 which comes to $716 plus shipping. But that only gets you 12" off the ground which in my opinion is not enough room to work comfortably under a car all day long??
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treblig

Nope. Set of 4 of the 12" Race Ramps wheel cribs run $250. And there is free shipping at places like Summit Racing. You don't need the "ramp" parts, nor are any ramps included with the Lift Stands shown above. If you need a couple more inches of height just throw a couple 2 x 6 boards under the stand. Race Ramps Wheel Cribs RR-WC-12