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Research has shown that it is impossible for people to sink into quicksand much beyond the waist -- but it is equally impossible to pull someone out once they are stuck.
Any attempt to drag a person out with a horse or truck would put them in much greater danger than leaving them be: the forces involved would tear them apart. To pull a person's foot out would require as much force as it takes to lift a family car, and the body would give way before the sand relinquished its grip.