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> I meant more that I wouldn't have expected to be able to just completely
> disregard 3/4 the weight of the object just because I'm only looking at
> one wheel.
Why not? A car has 4 wheels, the weight is (roughly) spread evenly between
the 4 wheels. If you want something to support one wheel it need only
support 1/4 of the total weight, plus a bit for safety.
> So it's probably rated to 5 tonnes or something.
As I said, it seems most common ones are rated to 2 ton for the pair, so
that would be 1000 kg per ramp/wheel. That should cater for most normal
passenger cars, plus quite a lot to spare.
>> 0.2 mm or thereabouts.
>
> ...my God. You can make metal that thin?? o_O
You've seen aluminium foil haven't you? That's probably 10x thinner. You
just force it through a pair of rollers that are very close together.
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