Yes to the chocks, although it's worth noting that in a crush situation you should aim to remove the crushing object within 15 minutes. Any later than that and

Yes to the chocks, although it's worth noting that in a crush situation you should aim to remove the crushing object within 15 minutes. Any later than that and you risk killing the casualty through crush syndrome.[0] [0] https://en.wikipedia.org/wiki/Crush_syndrome https://en.wikipedia.org/wiki/Crush_syndrome