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fire extinguisher as a wheel chock...

For those who carry... fire extinguishers, the most common fire extinguishers are the 'powder type'. These need to be 'tapped' softly as described. Otherwise the extinguisher is only useful for a rather ineffective wheel chock.
"Use a rubber mallet to firmly tap the bottom of it several times. Over time, the ABC powder inside an extinguisher can compact at the bottom (or the side if carried horizontally). When it does that it leaves it virtually useless when an emergency strikes. So you'll want to do this every several months to loosen up the powder." Check the pressure while you are at it...
 
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