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Registered
Join Date: Jun 2002
Location: Winnipeg, MB, Canada
Posts: 3,963
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" The concrete driveway is 4cm thick. I plan to use either metal pads or 2cm thick concrete tiles to help spread the weight."
As 2.5 cm = 1" that doesn't seem to be thick enough to support the weight load you are planning.
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Bunch of old cars 
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