> 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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