Final answer:
Moonshine runners utilized stock cars to discreetly transport illegal alcohol while avoiding police attention during Prohibition. These cars looked ordinary but were modified for speed and heavy cargo.
Step-by-step explanation:
Moonshine runners used "stock" cars during Prohibition because the sale of alcohol was illegal, and they did not want to attract law enforcement attention. Moonshine runners used "stock" cars because the sale of alcohol was illegal, and the drivers did not want to attract law enforcement. These runners modified the cars to appear ordinary on the outside, while under the hood, they were enhanced to increase speed and handle the heavy cargo of moonshine. The modifications allowed them to transport their illegal cargo quickly and surreptitiously, evading the police who were enforcing prohibition laws.